diff --git a/pom.xml b/pom.xml
index 99cfb53..567a0e0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>com.kamesuta</groupId>
     <artifactId>SchemUploader</artifactId>
-    <version>1.5-SNAPSHOT</version>
+    <version>1.6-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>SchemUploader</name>
@@ -42,26 +42,6 @@
                         </configuration>
                     </execution>
                 </executions>
-                <configuration>
-                    <relocations>
-                        <relocation>
-                            <pattern>com.squareup.okhttp</pattern>
-                            <shadedPattern>com.kamesuta.schemuploader.lib.com.squareup.okhttp</shadedPattern>
-                        </relocation>
-                        <relocation>
-                            <pattern>org.apache.commons.lang3</pattern>
-                            <shadedPattern>com.kamesuta.schemuploader.lib.org.apache.commons.lang3</shadedPattern>
-                        </relocation>
-                        <relocation>
-                            <pattern>okio</pattern>
-                            <shadedPattern>com.kamesuta.schemuploader.lib.okio</shadedPattern>
-                        </relocation>
-                        <relocation>
-                            <pattern>com.kamesuta.commandlib</pattern>
-                            <shadedPattern>com.kamesuta.schemuploader.lib.commandlib</shadedPattern>
-                        </relocation>
-                    </relocations>
-                </configuration>
             </plugin>
         </plugins>
         <resources>
@@ -90,11 +70,6 @@
             <version>1.16.5-R0.1-SNAPSHOT</version>
             <scope>provided</scope>
         </dependency>
-        <dependency>
-            <groupId>com.squareup.okhttp</groupId>
-            <artifactId>okhttp</artifactId>
-            <version>2.7.5</version>
-        </dependency>
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
diff --git a/src/main/java/com/kamesuta/schemuploader/CommandListener.java b/src/main/java/com/kamesuta/schemuploader/CommandListener.java
index 89bf43e..bc8d7d2 100644
--- a/src/main/java/com/kamesuta/schemuploader/CommandListener.java
+++ b/src/main/java/com/kamesuta/schemuploader/CommandListener.java
@@ -64,6 +64,13 @@ public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command
                 sender.sendMessage(plugin.messages.error("error_invalid_folder"));
                 return true;
             }
+
+            // Check if the file exists
+            if (!schemFile.exists()) {
+                sender.sendMessage(plugin.messages.error("error_not_found", schemFileName));
+                return true;
+            }
+
             // Get the name and UUID of the sender
             String senderName = sender.getName();
             UUID senderUUID = (sender instanceof Player) ? ((Player) sender).getUniqueId() : null;
diff --git a/src/main/resources/messages_en.yml b/src/main/resources/messages_en.yml
index 9568cc2..420ae12 100644
--- a/src/main/resources/messages_en.yml
+++ b/src/main/resources/messages_en.yml
@@ -3,6 +3,7 @@ prefix: "[SchemUploader] "
 error_invalid_folder: "You can only specify locations within the WorldEdit schematic folder"
 error_http_status: "HTTP status code: %d"
 error_io: "IO error: %s"
+error_not_found: "File %s does not exist"
 error_not_schematic: "The file is not a schematic file"
 error_already_exists: "%s already exists. Please specify -f to overwrite"
 error_file_size_exceeded: "File size exceeds maximum limit (%d Bytes)"
diff --git a/src/main/resources/messages_ja.yml b/src/main/resources/messages_ja.yml
index 82abcab..c7986f6 100644
--- a/src/main/resources/messages_ja.yml
+++ b/src/main/resources/messages_ja.yml
@@ -3,6 +3,7 @@ prefix: "[SchemUploader] "
 error_invalid_folder: "WorldEditのschematicフォルダー以外の場所を指定することはできません"
 error_http_status: "HTTPステータスコード: %d"
 error_io: "IOエラー: %s"
+error_not_found: "ファイル %s が存在しません"
 error_not_schematic: "ファイルがschematicファイルではありません"
 error_already_exists: "%s は既に存在します。上書きする場合は -f を指定してください"
 error_file_size_exceeded: "ファイルサイズが大きすぎます (最大 %d Bytes)"