Error when trying saving in database

Hi! I have this error when i try to save in database. The sever log is server.log My openmrs version is 2.2.0-SNAPSHOT.

These resources are very useful: https://wiki.openmrs.org/display/docs/Supporting+different+OpenMRS+versions https://wiki.openmrs.org/display/docs/Supporting+Platform+2.0+and+below

If you are very new to openmrs and finding it hard to digest the above, here is a shortcut that you can use: https://github.com/openmrs/openmrs-module-xforms/commit/5d79f327d27777a40ec755a90433e4dc69067e4a

Ok. Thanks. I’ll try it