Legacy GM 'Variable not set' error, but it's not a variable at all.

[lonedarkness]

I'm getting this error.


___________________________________________
############################################################################################
FATAL ERROR in
action number 1
of Step Event0
for object Ob_TestPlayerSlopes:

Variable Ob_TestPlayerSlopes.yes(100036, -2147483648) not set before reading it.
at gml_Object_Ob_TestPlayerSlopes_StepNormalEvent_1 (line 122) - if (collision_rectangle(x+8, y+1, sign(move)*(x+(sprite_width/2)+abs(hsp)), y+5, par_slope, yes, yes))
############################################################################################
--------------------------------------------------------------------------------------------
stack frame is
gml_Object_Ob_TestPlayerSlopes_StepNormalEvent_1 (line 122)

Normally, 'variable not set' is easy enough to take care of, but as you can see, the 'variable' is not a variable - it's an argument of the collision_rectangle function, and one that needs to be present or else my project won't compile.
Anyone know why this is happening?

 

[IndianaBones]

You need replace the yes with a value of either true or false. Literally you need to write true to activate the given parameter, or false to disable it. The manual for the collision_rectangle() function has further usage examples. yes is not a keyword in the game maker language, so its just treated as another variable, an undefined one in this case.