Parse error: pluginactivation.php on line 1

This is three times I’ve had to reinstall this theme and enter the purchase code for this site. It will not allow me to go into the subdomain using the wordpress link /wp-admin sign in method to even activate it again. I have contacted Bluehost and they have told me that this is the developer issue.
I’ve had this theme for over a year activated, even worked on the site but every so often this error comes up instead of seeing the site. Please advise if I have to again backup up the subdomain, then reinstall wordpress and then reinstall Blackfrye just to get back to the screen and re-enter the code to activate the theme?
Once this has been activated we should not have to keep doing this. The activation of the theme should be permanent.The theme activation should be removed once it has been properly activated the first time.

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Thank you for your time and looking forward to a solution.