No problem. It looks like the mbed cache on your machine could be corrupt. Please try deleting the %USERPROFILE%\.mbed folder with all contents.
If it doesn’t help, please try opening View->Other Windows->VisualGDB Diagnostics Console, and then run the wizard. The diagnostics console will show the command used by VisualGDB to clone the mbed repository. Please try running it manually in the Command Prompt window and check if it works as expected.
If it doesn’t help, please let us know the command recovered from the Diagnostics Console, as well as the result of running it manually, and we will help you get it running.