fix error code

src/application/dtos/processing_result_dto.py

@@ -51,8 +51,7 @@ class ProcessingResultDto:
         if self.error_code:
             valid_error_codes = [
                 'STT_ERROR', 'TRANSLATION_ERROR', 'TTS_ERROR',
-                'AUDIO_FORMAT_ERROR', 'VALIDATION_ERROR', 'SYSTEM_ERROR',
-                'AUDIO_PROCESSING_FAILED'  # Add missing error code
+                'AUDIO_FORMAT_ERROR', 'VALIDATION_ERROR', 'SYSTEM_ERROR'
             ]
             if self.error_code not in valid_error_codes:
                 raise ValueError(f"Invalid error code: {self.error_code}. Valid codes: {valid_error_codes}")

src/application/error_handling/error_mapper.py

@@ -141,7 +141,7 @@ class ErrorMapper:
             # General audio processing errors
             AudioProcessingException: ErrorMapping(
                 user_message="Audio processing failed. There was an issue processing your audio file.",
-                error_code="AUDIO_PROCESSING_FAILED",
+                error_code="AUDIO_FORMAT_ERROR",  # Use existing valid error code
                 severity=ErrorSeverity.HIGH,
                 category=ErrorCategory.PROCESSING,
                 recovery_suggestions=[