Wrong error message logging when model_path does not exist

[jopemachine]

Summary  

• When the model path is set to a non-existent directory, errors unrelated to the actual issue may be logged.

Steps to Reproduce  

1. When creating a new model service, deliberately set the model_path to a non-existent directory.
2. Check the container logs of the session created by the model service.

Expected Behavior  

• A log indicating that the model path does not exist should be output.

Actual Behavior  

• A "not found" error log for the first element of start_command is printed.

Logs/Errors  

• A "not found" error log for the first element of start_command is printed.