Unable to create content fragment model in AEM 6.5 throws server error

I'm unable to create a content fragment model in one of our environments even when I'm logged in with admin. It throws a server error.

Attaching screenshot and stack trace in the comments below.



22.05.2020 04:23:03.064 *ERROR* [10.30.60.206 [1590139383053] POST /mnt/overlay/dam/cfm/models/console/content/createmodelwizard.html/conf/dam/cfm/models/console/content/createmodelwizard/_jcr_content HTTP/1.1] org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught SlingException

java.lang.NullPointerException: null

at org.apache.jsp.apps.cq.Page.POST_jsp._jspService(POST_jsp.java:208)

at org.apache.sling.scripting.jsp.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) [org.apache.sling.scripting.jsp:2.3.6]

at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) [org.apache.felix.http.servlet-api:1.1.2]

at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:502) [org.apache.sling.scripting.jsp:2.3.6]

at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:449) [org.apache.sling.scripting.jsp:2.3.6]

at org.apache.sling.scripting.jsp.JspScriptEngineFactory.callJsp(JspScriptEngineFactory.java:339) [org.apache.sling.scripting.jsp:2.3.6]

Solution:

Two Things
1) If you have installed the Service pack recently-There might possibilities that your core package affected and it's not Active state. Please verify it and try to restart the AEM.

2) If the issue persists, then uninstall the SP and install it again with another browser except for chrome and see all bundles are getting an Active state or not.

Once your all bundles are active then you good to go.

NOTE:

Can you Invalidate Caches then Rebuild Libraries [1] and give it a try in a private browser?

[1] http://[host]:[port]/libs/granite/ui/content/dumplibs.rebuild.html