It is not starting ?!

[HeroEsnz 0]

The first time i opened it this error poped up (i am using Windows 10):

___________________________________________
############################################################################################
ERROR in
action number 1
of Create Event
for object app:

Error defining an external function.
############################################################################################
--------------------------------------------------------------------------------------------
called from - gml_Script_lib_init (line 18)
called from - gml_Script_app_startup (line 12)
called from - gml_Script_app_event_create (line 3)
called from - gml_Object_app_Create_0 (line 2)

Help please!!!

Edited April 26, 2017 by HeroEsnz

[Creeper2555 852]

reinstall.

[HeroEsnz 0]

reinstalling changes nothing

But Thanks for help :3

[HeroEsnz 0]

And the installer isnt working at all. It always tells its unvalid or damaged.