Provisioning Module | Custom function calls for client area

I'm not sure what i'm doing wrong. But i keep getting this error when trying to call custom functions from the module via client area buttons. Unauthorized Access Attempt is what i get. Im using this within the ClientArea function
<form method="post" action="clientarea.php?action=productdetails">
<input type="hidden" name="id" value="{$serviceid}" />
<input type="hidden" name="modop" value="custom" />
<input type="hidden" name="a" value="reboot" />
<input type="submit" value="Reboot Server" />
</form>
the button shows up but i get that error when i click it.