Error Cheatin’ uh?

When i up to file "supporter-premium-support.php" to folder "mu-plugins". Then i go to wp-admin of child blog (http://abcd.com/blog1/wp-admin) -> go to Supporter/Premium plugins but available and show on page a Sentence :Cheatin’ uh?. Is this a error Plugin supporter? Can i help me to solve this problem?

Regards,
Mr Tony