Styles missing from InvoicePlane install

Hi,

I work with Invoice Plane for a couple of years now, but I don’t know what is happening here. I checked all the PhP settings, but everything should be OK.
I tried to search the forum, but I don’t know wat to search for.
Could anyone point me in the right direction.

Your styles are missing.

  • figure out which version you are using.
    Let’s say you are using version 1.6.2

Either: