OS X Wants to move SourceTree to Trash

[SteffeyDev]

After downloading a fresh copy of SourceTree, and moving it to my applications folder, I get the error:

"SourceTree" will damage your computer. You should move it to the Trash.

Followed by the options to "Cancel" or "Move to Trash".  This message has the gatekeeper logo next to it.

In the console, I get the error:

com.apple.xpc.launchd[1]: (com.apple.xpc.launchd.oneshot.0x10000073.SourceTree[8402]) Service exited due to signal: Killed: 9

Any idea what this is about?  I am running El Capitan, though SourceTree works on another El Capitan system I have, so I don't think that is the problem.  Gatekeeper is set to open apps from the Mac App Store and Identified Developers, though I already added the exception for SourceTree so I don't believe that would cause this either.

Thank you for your time

[sreekumar_menon]

I think it is the gatekeeper . 

https://www.yourkit.com/download/mountain_lion.html