UnExpected error when updating project

UnExpected error when updating project

Hi,

I would like to update some information on one project, but after editing the project, and clicking on the "update" button with or even without any modification, I just receive an error message : UnExpected error occured.

This error occures on each existing project, even on a new project created just now to check.

How can I find the problem and solve it ?

thanks for your help.

Additional info :  Service Desk Plus MSP 8.3 Build 8304
Same problem within Firefox and IE
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