diff --git a/dlc-messages/src/channel.rs b/dlc-messages/src/channel.rs
index 2798f63b..4a664dc4 100644
--- a/dlc-messages/src/channel.rs
+++ b/dlc-messages/src/channel.rs
@@ -124,7 +124,7 @@ impl OfferChannel {
             && self.cet_nsequence >= min_cet_nsequence
             && self.cet_nsequence <= max_cet_nsequence;
         if !valid_dates {
-            return Err(Error::InvalidArgument);
+            return Err(Error::InvalidArgument("Invalid dates".to_string()));
         }
 
         match &self.contract_info {
diff --git a/dlc-messages/src/lib.rs b/dlc-messages/src/lib.rs
index f6b76826..3ca8d7a0 100644
--- a/dlc-messages/src/lib.rs
+++ b/dlc-messages/src/lib.rs
@@ -383,7 +383,7 @@ impl OfferDlc {
             ContractInfo::SingleContractInfo(s) => s.contract_info.oracle_info.validate(secp)?,
             ContractInfo::DisjointContractInfo(d) => {
                 if d.contract_infos.len() < 2 {
-                    return Err(Error::InvalidArgument);
+                    return Err(Error::InvalidArgument("Contract infos length smaller than 2".to_string()));
                 }
 
                 for c in &d.contract_infos {
@@ -397,7 +397,7 @@ impl OfferDlc {
             && closest_maturity_date + min_timeout_interval <= self.refund_locktime
             && self.refund_locktime <= closest_maturity_date + max_timeout_interval;
         if !valid_dates {
-            return Err(Error::InvalidArgument);
+            return Err(Error::InvalidArgument("Invalid dates".to_string()));
         }
 
         Ok(())
diff --git a/dlc-messages/src/oracle_msgs.rs b/dlc-messages/src/oracle_msgs.rs
index aa779a58..7a844b07 100644
--- a/dlc-messages/src/oracle_msgs.rs
+++ b/dlc-messages/src/oracle_msgs.rs
@@ -224,7 +224,7 @@ impl OracleEvent {
         if expected_nb_nonces == self.oracle_nonces.len() {
             Ok(())
         } else {
-            Err(Error::InvalidArgument)
+            Err(Error::InvalidArgument("Expected nb nonces is not equal to oracle nonecs length".to_string()))
         }
     }
 }
diff --git a/dlc-trie/src/multi_oracle_trie.rs b/dlc-trie/src/multi_oracle_trie.rs
index 20f979a2..c2b397d4 100644
--- a/dlc-trie/src/multi_oracle_trie.rs
+++ b/dlc-trie/src/multi_oracle_trie.rs
@@ -168,7 +168,7 @@ impl MultiOracleTrie {
     /// Creates a new MultiOracleTrie
     pub fn new(oracle_numeric_infos: &OracleNumericInfo, threshold: usize) -> Result<Self, Error> {
         if oracle_numeric_infos.nb_digits.is_empty() {
-            return Err(Error::InvalidArgument);
+            return Err(Error::InvalidArgument("Oracle numeric infos nb digits is empty".to_string()));
         }
         let digit_trie = DigitTrie::new(oracle_numeric_infos.base);
         let extra_cover_trie = if oracle_numeric_infos.has_diff_nb_digits() {
diff --git a/dlc-trie/src/multi_oracle_trie_with_diff.rs b/dlc-trie/src/multi_oracle_trie_with_diff.rs
index 67c87c76..505b13d7 100644
--- a/dlc-trie/src/multi_oracle_trie_with_diff.rs
+++ b/dlc-trie/src/multi_oracle_trie_with_diff.rs
@@ -33,7 +33,7 @@ impl MultiOracleTrieWithDiff {
         let is_valid =
             nb_oracles >= 1 && threshold <= nb_oracles && min_support_exp < max_error_exp;
         if !is_valid {
-            return Err(Error::InvalidArgument);
+            return Err(Error::InvalidArgument("Invalid nb oracles".to_string()));
         }
         let multi_trie = MultiTrie::new(
             oracle_numeric_infos,
diff --git a/dlc-trie/src/utils.rs b/dlc-trie/src/utils.rs
index e559fcff..559ed655 100644
--- a/dlc-trie/src/utils.rs
+++ b/dlc-trie/src/utils.rs
@@ -18,7 +18,7 @@ pub(crate) fn get_adaptor_point_for_indexed_paths(
     debug_assert!(indexes.len() == paths.len());
     debug_assert!(precomputed_points.len() >= indexes.len());
     if indexes.is_empty() {
-        return Err(super::Error::InvalidArgument);
+        return Err(super::Error::InvalidArgument("Indexes is empty".to_string()));
     }
 
     let mut keys = Vec::new();
diff --git a/dlc/src/channel/mod.rs b/dlc/src/channel/mod.rs
index d97d2580..124df045 100644
--- a/dlc/src/channel/mod.rs
+++ b/dlc/src/channel/mod.rs
@@ -302,7 +302,7 @@ pub fn create_renewal_channel_transactions(
     };
 
     if fund_output.value <= extra_fee + super::DUST_LIMIT {
-        return Err(Error::InvalidArgument);
+        return Err(Error::InvalidArgument(format!("Fund output: {} smaller or equal to extra fee: {} + dust limit: {}", fund_output.value, extra_fee, super::DUST_LIMIT)));
     }
 
     let outpoint = OutPoint {
@@ -392,7 +392,7 @@ pub fn sign_cet<C: Signing>(
 
     descriptor
         .satisfy(&mut cet.input[0], sigs)
-        .map_err(|_| Error::InvalidArgument)?;
+        .map_err(|e| Error::InvalidArgument(format!("{e:#}")))?;
 
     Ok(())
 }
@@ -422,7 +422,7 @@ pub fn satisfy_buffer_descriptor(
 
     descriptor
         .satisfy(&mut tx.input[0], sigs)
-        .map_err(|_| Error::InvalidArgument)?;
+        .map_err(|e| Error::InvalidArgument(format!("{e:#}")))?;
 
     Ok(())
 }
@@ -498,7 +498,7 @@ pub fn create_and_sign_punish_buffer_transaction<C: Signing>(
 
     descriptor
         .satisfy(&mut tx.input[0], sigs)
-        .map_err(|_| Error::InvalidArgument)?;
+        .map_err(|e| Error::InvalidArgument(format!("{e:#}")))?;
 
     Ok(tx)
 }
@@ -578,7 +578,7 @@ pub fn create_and_sign_punish_settle_transaction<C: Signing>(
 
     descriptor
         .satisfy(&mut tx.input[0], sigs)
-        .map_err(|_| Error::InvalidArgument)?;
+        .map_err(|e| Error::InvalidArgument(format!("{e:#}")))?;
 
     Ok(tx)
 }
diff --git a/dlc/src/channel/sub_channel.rs b/dlc/src/channel/sub_channel.rs
index bb0d59ab..330338b2 100644
--- a/dlc/src/channel/sub_channel.rs
+++ b/dlc/src/channel/sub_channel.rs
@@ -87,14 +87,14 @@ pub fn create_split_tx(
 
     let dlc_output_value = dlc_collateral
         .checked_add(dlc_fee)
-        .ok_or(Error::InvalidArgument)?;
+        .ok_or(Error::InvalidArgument("Failed to checked add dlc fee to dlc collateral".to_string()))?;
 
     if dlc_output_value
         > channel_value
             .checked_add(crate::DUST_LIMIT)
-            .ok_or(Error::InvalidArgument)?
+            .ok_or(Error::InvalidArgument("Failed to checked add dust limit to channel value".to_string()))?
     {
-        return Err(Error::InvalidArgument);
+        return Err(Error::InvalidArgument(format!("Dlc output value greater than channel value: {} + dust limit: {}", channel_value, crate::DUST_LIMIT)));
     }
 
     let ln_output_value = channel_value
@@ -238,7 +238,7 @@ pub fn create_and_sign_punish_split_transaction<C: Signing>(
 
         descriptor
             .satisfy(&mut tx.input[i], sigs.clone())
-            .map_err(|_| Error::InvalidArgument)?;
+            .map_err(|e| Error::InvalidArgument(format!("{e:#}")))?;
     }
 
     Ok(tx)
diff --git a/dlc/src/lib.rs b/dlc/src/lib.rs
index f9e0fd3a..3c7800d0 100644
--- a/dlc/src/lib.rs
+++ b/dlc/src/lib.rs
@@ -69,7 +69,7 @@ pub const P2WPKH_WITNESS_SIZE: usize = 107;
 
 macro_rules! checked_add {
     ($a: expr, $b: expr) => {
-        $a.checked_add($b).ok_or(Error::InvalidArgument)
+        $a.checked_add($b).ok_or(Error::InvalidArgument("Failed to checked add".to_string()))
     };
     ($a: expr, $b: expr, $c: expr) => {
         checked_add!(checked_add!($a, $b)?, $c)
@@ -182,7 +182,7 @@ pub enum Error {
     /// An error while computing a signature hash
     Sighash(bitcoin::util::sighash::Error),
     /// An invalid argument was provided
-    InvalidArgument,
+    InvalidArgument(String),
     /// An error occurred in miniscript
     Miniscript(miniscript::Error),
 }
@@ -213,9 +213,9 @@ impl From<miniscript::Error> for Error {
 
 impl fmt::Display for Error {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match *self {
+        match self {
             Error::Secp256k1(_) => write!(f, "Secp256k1 error"),
-            Error::InvalidArgument => write!(f, "Invalid argument"),
+            Error::InvalidArgument(message) => write!(f, "Invalid argument {message}"),
             Error::Sighash(_) => write!(f, "Error while computing sighash"),
             Error::Miniscript(_) => write!(f, "Error within miniscript"),
         }
@@ -227,7 +227,7 @@ impl std::error::Error for Error {
         match self {
             Error::Secp256k1(e) => Some(e),
             Error::Sighash(e) => Some(e),
-            Error::InvalidArgument => None,
+            Error::InvalidArgument(_) => None,
             Error::Miniscript(e) => Some(e),
         }
     }
@@ -278,7 +278,7 @@ impl PartyParams {
             let script_weight = util::redeem_script_to_script_sig(&w.redeem_script)
                 .len()
                 .checked_mul(4)
-                .ok_or(Error::InvalidArgument)?;
+                .ok_or(Error::InvalidArgument("Failed to multiple 4 to script weight".to_string()))?;
             inputs_weight = checked_add!(
                 inputs_weight,
                 TX_INPUT_BASE_WEIGHT,
@@ -290,7 +290,7 @@ impl PartyParams {
         // Value size + script length var_int + ouput script pubkey size
         let change_size = self.change_script_pubkey.len();
         // Change size is scaled by 4 from vBytes to weight units
-        let change_weight = change_size.checked_mul(4).ok_or(Error::InvalidArgument)?;
+        let change_weight = change_size.checked_mul(4).ok_or(Error::InvalidArgument("failed to multiply 4 to change size".to_string()))?;
 
         // Base weight (nLocktime, nVersion, ...) is distributed among parties
         // independently of inputs contributed
@@ -313,13 +313,13 @@ impl PartyParams {
             .payout_script_pubkey
             .len()
             .checked_mul(4)
-            .ok_or(Error::InvalidArgument)?;
+            .ok_or(Error::InvalidArgument("failed to multiply 4 to payout script pubkey length".to_string()))?;
         let total_cet_weight = checked_add!(this_party_cet_base_weight, output_spk_weight)?;
         let cet_or_refund_fee = util::weight_to_fee(total_cet_weight, fee_rate_per_vb)?;
         let required_input_funds =
             checked_add!(self.collateral, fund_fee, cet_or_refund_fee, extra_fee)?;
         if self.input_amount < required_input_funds {
-            return Err(Error::InvalidArgument);
+            return Err(Error::InvalidArgument(format!("input amount: {} smaller than required input funds: {} (collateral: {}, fund_fee: {}, cet_or_refund_fee: {}, extra_fee: {})", self.input_amount, required_input_funds, self.collateral, fund_fee, cet_or_refund_fee, extra_fee)));
         }
 
         let change_output = TxOut {
@@ -476,8 +476,13 @@ pub(crate) fn create_cets_and_refund_tx(
         }
     });
 
+    let total_in_offer = payouts.iter().map(|p| checked_add!(p.offer, p.accept).unwrap_or(0)).collect::<Vec<u64>>().iter().sum::<u64>();
+    dbg!(total_in_offer);
+
     if !has_proper_outcomes {
-        return Err(Error::InvalidArgument);
+        dbg!(has_proper_outcomes);
+        dbg!(total_collateral);
+        return Err(Error::InvalidArgument("payouts doe not have proper outcomes".to_string()));
     }
 
     let cet_input = TxIn {
@@ -667,7 +672,7 @@ fn get_oracle_sig_point<C: secp256k1_zkp::Verification>(
     msgs: &[Message],
 ) -> Result<PublicKey, Error> {
     if oracle_info.nonces.len() < msgs.len() {
-        return Err(Error::InvalidArgument);
+        return Err(Error::InvalidArgument("length of oracle info nonces is smaller than msgs length".to_string()));
     }
 
     let sig_points: Vec<PublicKey> = oracle_info
@@ -690,7 +695,7 @@ pub fn get_adaptor_point_from_oracle_info<C: Verification>(
     msgs: &[Vec<Message>],
 ) -> Result<PublicKey, Error> {
     if oracle_infos.is_empty() || msgs.is_empty() {
-        return Err(Error::InvalidArgument);
+        return Err(Error::InvalidArgument("empty oracle infos or msgs".to_string()));
     }
 
     let mut oracle_sigpoints = Vec::with_capacity(msgs[0].len());
@@ -776,7 +781,7 @@ pub fn create_cet_adaptor_sigs_from_oracle_info(
     msgs: &[Vec<Vec<Message>>],
 ) -> Result<Vec<EcdsaAdaptorSignature>, Error> {
     if msgs.len() != cets.len() {
-        return Err(Error::InvalidArgument);
+        return Err(Error::InvalidArgument("length of msgs is not equal to length of cets".to_string()));
     }
 
     cets.iter()
diff --git a/dlc/src/util.rs b/dlc/src/util.rs
index 68948f05..bb5d0354 100644
--- a/dlc/src/util.rs
+++ b/dlc/src/util.rs
@@ -102,7 +102,7 @@ pub fn weight_to_fee(weight: usize, fee_rate: u64) -> Result<u64, Error> {
     Ok(u64::max(
         (f64::ceil((weight as f64) / 4.0) as u64)
             .checked_mul(fee_rate)
-            .ok_or(Error::InvalidArgument)?,
+            .ok_or(Error::InvalidArgument(format!("Failed to multiply fee rate: {} to weight", fee_rate )))?,
         MIN_FEE,
     ))
 }
@@ -254,7 +254,7 @@ pub(crate) fn compute_var_int_prefix_size(len: usize) -> usize {
 /// Validate that the fee rate is not too high
 pub fn validate_fee_rate(fee_rate_per_vb: u64) -> Result<(), Error> {
     if fee_rate_per_vb > 25 * 250 {
-        return Err(Error::InvalidArgument);
+        return Err(Error::InvalidArgument(format!("Fee rate: {} greater than 25 * 250", fee_rate_per_vb)));
     }
 
     Ok(())