osTicket installing but not working

My YunoHost server

Hardware: Dedicated Server from ISP: Intel Xeon X3450 - 2.66 GHz - 4 core(s) 8GB - DDR3
YunoHost version: 4.3.3
I have access to my server : Through SSH | through the webadmin
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

Description of my issue

I installed osTicket via Admin-Panel. When i try to access it I get blank page with:

Error: Contact system admin.

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