could not find label 'ch3_main'. error help!!!

[adagio29]

While running game code:
File "game/script.rpy", line 56, in script call
File "game/script.rpy", line 56, in script call
ScriptError: could not find label 'ch3_main'.

-- Full Traceback ------------------------------------------------------------

Full traceback:
File "game/script.rpy", line 56, in script call
File "C:\Users\pc1\Videos\ddlc\DDLC-1.1.0-pc\renpy\ast.py", line 1322, in execute
rv = renpy.game.context().call(label, return_site=self.next.name)
File "game/script.rpy", line 56, in script call
File "C:\Users\pc1\Videos\ddlc\DDLC-1.1.0-pc\renpy\script.py", line 858, in lookup
raise ScriptError("could not find label '%s'." % str(original))
ScriptError: could not find label 'ch3_main'.