[SOLVED] Major problem 5.3.1 : Mutex problem (creating activity problem)

Hi everybody,

I recently installed Projeqtor 5.3.0 and I upgraded this to 5.31 few minutes ago.
I had a problem with the 5.3.0 version and it continues with the version 5.3.1.
I can not add Activity to my project, if I try, I have an error message saying "please contact an administrator". I checked log file and I see these lines :
"2016-03-30 08:21:49.845 ***** ERROR ***** ERROR *****
2016-03-30 08:21:49.845 ***** ERROR ***** on file 'C:\xampp\htdocs\projeqtor\model\Mutex.php' at line (29)
2016-03-30 08:21:49.845 ***** ERROR ***** cause = Methods with the same name as their class will not be constructors in a future version of PHP; Mutex has a deprecated constructor"

May you help us please.
It's a critical problem for us. We use the platform to manage project and the application is not available and not usable because we can't create activities and it's the same problem with tickets and others functionnalities.

Thanks for your time.
I hope this will be fixed a.s.a.p

Loïc

Replace line 35 in model/Mutex.php from:
function Mutex
to
function __construct

Thanks for the fix.
It works ! Thanks a lot