Check your layer names and folder names. Try replacing all spaces and
symbols with letters and underscores.
Also, to find the problem layer, make a copy of your map and remove layers
until the error no longer exists.. This may solve the osm map.  Check your
over view map to for problem layers.

On Wed., Aug. 3, 2022, 11:26 p.m. Hadis Alinia, <[email protected]>
wrote:

> Hi,
>
> Mapguide server was working well until yesterday. Today I get an error
> message for all the tasks under the "task list" in the fusion. This error
> relates to the PHP.
>
> By clicking any of the tasks buttons I get  "PHP Warning:
> session_start(): Cannot start session with empty session ID in C:\Program
> Files\OSGeo\MapGuide\Web\www\fusion\layers\MapGuide\php\Common.php on line
> 96"
> also "500 internal server error, there is a problem with the resource you
> are looking for, and it can not be displayed"
>
> The other issue I have is that the OpenStreetMap doesn't show up and I get
> "net::ERR_CERT_COMMON_NAME_INVALID"
>
> Hadis
>
>
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>
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