String reference not set to an instance of a string. parameter 's'

Does any one have a solution for this error

string reference not set to an instance of a string. parameter ‘s’

Running windows 10
Fresh windows 10 install, sql express 2017. Enter licence email and password.
Run SambaPos and this pops up. SambaPos won’t licence

Thanks

That is not the most current version. Please download the latest sambapos from our website and be sure and run license.exe first.