Hi Luca, would you be able to see any additional error messages from logs ? It could be conflicting from different JAR files dependencies (having the same methods name.
As a suggestion, you can download the source code again in a new folder and running locally to confirm if you face the same error locally as it happens on the server.
I suspect this is down to how security has been implemented on your on-premise server. It looks like you don’t have permission to write files to the default location. To fix this, try using getTempPath from the Core API to get a folder you can read and write to. Alternatively, check your server settings to see if there is a way to enable file access to the default location.
https://apidocs.rnd.mendix.com/9/runtime/com/mendix/core/conf/Configuration.html#getTempPath()
I hope this helps. Good luck!
Hi,
Make sure to synchronize the project directory.