Hi, to create a LOG file

# You are going to find two files : logging-on.reg and logging-off.reg.
# Before opening Skype, you should double-click on logging-on.reg.
# Then open Skype and replicate the bug.
# After closing Skype, double-click logging-off.reg.
# The debug.log will be in the Skype directory.

Please visit https://developer.skype.com/Support/LogFile

Regards,

Skype Developer support