HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerException

Hello friends, Have encoutered a runtime exception while i was creating a cohort report form. Have recognised the problem may be in my tomcat but could not understand exactly where the problem may arise from. here is a pastebin link https://pastebin.com/Bs38wd94 cc @mozzy, @dkayiwa

have you made any code changes any were?

No havent made any code changes

could this be help https://wiki.openmrs.org/pages/viewpage.action?pageId=19300405

thanks @herbert24 thats the procedure i was following in creating a cohort report but got that error logs in the above pastebin

there is something i have realised just now into the error logs of my tomcat, what could be the problem, this is tomcat logs https://pastebin.com/Qmv6ny7j thanks

Are you able to reproduce it on the demo server?

@dkayiwa not yet let me try reproducing it on the demo server thanks

Problem solved after using the demo server and finally when i used the RA following the exact procedures i got where i was stuck and fixed it, thanks @dkayiwa, @herbert24

Was those changes didnot make any sense https://issues.openmrs.org/projects/RA/issues/RA-1620?filter=allopenissues. https://mail.google.com/mail/u/0/#inbox/FMfcgxwDrHspWFkPxSXrwdsZMlkpjTMV
just wanted to inbox you