Since 3.7.0 a lot has changed. You can't just change the phonegap-version and hope for the best.
Read up in the PGB Blog since April 2015. Pay special attention to whitelisting, the plugins repo, the splashscreen plugin, and the gap:-less syntax.
Thanks for your reply. so I read the documentation that you said.
thanks for you reply, On the PGB blog I found all that i needed to change my config.xml file. to the new version.