Describe the bug
I was accidentally using the old -f command-line parameter with the main branch, and when I do I get a mysterious:

Execution failed for task ':main:Main.main()'.
> Process 'command 'C:/Program Files/Java/jdk-14/bin/java.exe'' finished with non-zero exit value 1

The help should print and say that -f is deprecated and use -c instead.

How we reproduce the bug
Steps to reproduce the behaviour:

1. Run validator with the old -f command line parameter from v2

Expected behaviour
Validator should tell me not to do that and what parameter to use instead

Observed behaviour
Validator just fails to execute without any output

Environment versions

• validator version: Tested with feat: export notice schema as json file #925 but should also apply to main branch
• Java version: JDK 14
• OS versions: Windows 10