Help Null Object Error

[Android Question]

I have a Samsung Note 3 and out of the blue I began to get an error message. I don't know what it's about nor how to fix it. Has anyone else had this error or know how to fix it?

attempt to invoke virtual method ' void.com.inhancetechnology.healthchecker.utils.Entitycollection.add (java.lang.Object) ' on a null object reference

 

[Deleted User]

Looks like one of your apps has a problem. What have you installed recently?

 

[Jetgop]

The only thing installed recently was the Vodi app which failed to install properly so I uninstalled it. No other apps installed in the last 3 weeks. Not sure why this is happening. I lost my login info for the original post account.