tc_simsdotnet.dll has not registered
1. Open a Command Prompt as administrator and run the below command. If you cannot run this command or it fails please speak to your IT support. Note: if Truancy Call is installed to a different place then you will need to supply the correct path.
regsvr32 "C:\Truancy Call\tc_simsdotnet.dll"
2. After registration, a message will appear telling you registration was successful
3. Try logging into Truancy Call again