Unable to login at my backend since I've installed mobilejoomla

Hi there! 
Big problem here. Since I installed mobilejoomla last friday I haven't been able to log into my site's backend. Black page win I try to log, and the error goes like this: PHP Warning:  Module 'timezonedb' already loaded in Unknown on line 0
Any suggestions? I'm so worried about the possibility of loosing my site. 
Many thanks in advance,

Juliana

Seems it's not MJ issue.
forums.cpanel.net/f5/modules-already-loaded-262092.html