Hello,

This is likely the result of a partial upgrade, where some but not all of the binaries get upgraded. To troubleshooting this, please try the following

1. Shut down the Tomcat service
2. Delete your modules and labkeyWebapp directories (be sure to actually delete the entire directory instead of copy-replace )
3. Recopy those directories from the new version you downloaded
4. Restart the Tomcat service

https://www.labkey.org/Documentation/wiki-page.view?name=trouble&_docid=wiki%3A32d70d44-ed56-1034-b734-fe851e088836

Thanks,
Chet