Couldnt load the model schema associated with this report

Greeting all 

i shared my report on Power BI service ( Connection method = Live , Tabular Cube ) to my workspace but some of the members have some issue : 

*) first probleme : 

"Couldnt load the model schema associated with this report , Make sure u have a connection to the server and try again "

also another memeber have this issue : 

anyone know what's the issue here , just for info all my members have Power BI Pro . 

Thanks in advance .