Fatal error: Call to undefined function dvm()

I need to build a view with Project-Case number which is absent in Casetracker module 5.x-1.3.-beta1. So I installed dev version which gives Project-Case number option in views, but unfortunately on any project page it gives an error:

Fatal error: Call to undefined function dvm() in /home/mysite/public_html/sites/all/modules/casetracker/casetracker.module on line 1452