Mobile App generations Fails

I am having below error in generating mobile app : 

No scripts found for hook "before_plugin_add".
Calling plugman.fetch on plugin ""
Fetching plugin "" via git clone
Running command: git clone --depth=1 /tmp/git/1540288515289
Command finished with error code 128: git clone,--depth=1,,/tmp/git/1540288515289
Error: Failed to fetch plugin via git.
Either there is a connection problems, or plugin spec is incorrect:
Error: git: Command failed with exit code 128 Error output:
Cloning into '/tmp/git/1540288515289'...

Attached the mobile app generation logs.