An error occurred attempting to change the effective UID to UID 0. The caller must have permission to change to UID 0 to trace processes associated with user identities other than their own user identity. The error is described by the z/OS® UNIX error number and reason code.
Ensure you have authority to change your UID. Obtain proper authority and rerun the bpxtrace command or rerun the command without specifying a different userid.