From QB64.org wiki
The ERROR statement is used to simulate a program error or to troubleshoot error handling procedures.
- ERROR codeNumber%
- Can be used to test an error handling routine by simulating an error.
- Error code 97 can be used to invoke the error handler for your own use, no real error in the program will trigger error 97.
- Use error codes between 100 and 200 for custom program errors that will not be responded to by QB64.
Example: Creating custom error codes for a program that can be handled by an ON ERROR handling routine.
- Note: Don't use error codes under 97 or over 200 as QB64 may respond to those errors and interrupt the program.