As a more experienced user you would know this in mentioned in the manual. I agree do not reinstall gamestudio but I have had the same message appear and only be rectified with the wait 1 clause after the level load. A level load is resource consuming and can cause a crash if it is not given 1 frame to pause first.

the problem is 'the action's name'
action player
{
player = me;
}
try to rename it f.i:
action player_act()
{
}
or what ever.
that's obvious.
'player' is reserved by the engine.

@Alex8888: Just read the manual and you see that there is of course nothing like this mentioned. But strange ideas sometimes come up, some users think that the engine is sort of "exhausted" after a huge command and needs a wait() to "recover"!

But please don't give such advices to newbies. Better read the manual and tutorial about how to load a level, there are examples just in the very first lesson, and of course without "wait"!

In previous gamestudio versions (roughly before 7.5) it was necessary to add a wait instruction after level_load to make it possible to ent_create objects.

EDIT:

(V7.07.2c beta: ok, long time ago)

In fact, in A7 you need never put a wait() after level_load.

In A6 you needed that wait() before you could create entities. There was a simple reason, level_load() in A6 was executed not immediately but at the end of the frame cycle. This was changed with A7. It's neither because of "resources consuming" nor will it "crash".

I also have often seen newcomers getting advices like "try a wait() here" or "try a wait() there". This never helps. It just wastes time and causes frustration.

the error was action player()
player cann't as action

obviously!!!!