can not generate load for comand

Please attach that STAAD.Pro model.

There are a lot of modeling issues in your model - the members are not intersecting each other, so there are many members which are not connected. If you go to Tools -> Check Multiple Structures you will find many such members highlighted. This can partially be fixed by using the member intersection command (Geometry -> Intersect Selected Members -> Intersect). However, there will still be many members in the model which are not intersecting. This can only be fixed by modifying the coordinates of the members which are not intersecting other members. So, before moving on with this model, you must fix all these modeling issues at first.

In addition to that, floor loads cannot be generated on the joist elements in STAAD.Pro.

There are a lot of modeling issues in your model - the members are not intersecting each other, so there are many members which are not connected. If you go to Tools -> Check Multiple Structures you will find many such members highlighted. This can partially be fixed by using the member intersection command (Geometry -> Intersect Selected Members -> Intersect). However, there will still be many members in the model which are not intersecting. This can only be fixed by modifying the coordinates of the members which are not intersecting other members. So, before moving on with this model, you must fix all these modeling issues at first.

In addition to that, floor loads cannot be generated on the joist elements in STAAD.Pro.

thank you for your help , i don't know what happen for some reason the coordinates of my nodes changed i think that i what caused the problem, i already had generated the load before and it showed me the load, but the other day i was using the software and and an unexpected error occurred and i had to close it when i opened again, i was checking the loads that is when the problem showed that i could not "generate the load for command".

in another question what do you mean by saying that the floor loads cannot be generated on the joist elements? that means that i have to add the load to each beam or member?