keytool error: java.lang.Exception: Key pair not generated, alias <author> already exists

Description

You tried to use the blackberry-keytool tool to create a self-signed Developer Certificate. The file name you provided for the output_file.p12 parameter already exists.

Possible solution

Change the file name so that blackberry-keytool creates the output file using a different name or location.

Possible solution

Delete your existing P12 file. Then run blackberry-keytool again.