That worked for me:
A re-download of the project fixed the issue for me.
Having same issues since last few days. Couldn't find any solutions. I had community_commons module, I removed it and then the project compiled and ran successfully.
But I think that wasn't an issue because today I ran into the same error again.
Even I am facing same issue. Did you solved this ??
This issue seemed to be duplicated jar files within the userlib folder in your project directory.
Note the problematic jar files down in the error window and remove the older versions of the jar files. My guess is that, it is conflicting filesThis issue seemed to be duplicated jar files within the userlib folder in your project directory.
Note the problematic jar files down in the error window and remove the older versions of the jar files. My guess is that, it is conflicting files
I was getting same issue on 2 developer machines, it seems like issue related to mendix runtime cache so after changing the port on my both the machines it worked for me. So right now this solution is 100% working for this error.
Ran into this issue today. I deleted the deployment, userlib, and .mendix-cache folders from my project directory. Ran an 'Update' on the project to redownload the files and I was able to rerun afterwards!