What does this mean? Anti-virus is blocking Skype

I have a similar issue that detected OSX/Installcore.o on Xcode and Evernote Spotlightfinder.
Hope someone from AVG can give an official answer to this

Hi guys, 

Today I've tried to log onto Skype and the attempt was blocked by AVG anti virus with a message of:

Threat blocked

Potentially unwanted application OSX Installcore.O

What does this mean? Up until yesterday there was no issue. 

Thanks

User Phil Tran has posted their own topic (https://support.avg.com/answers?id=906b0000000bodgAAA).
AVG Guru

I have a similar issue that detected OSX/Installcore.o on Xcode and Evernote Spotlightfinder.
Hope someone from AVG can give an official answer to this