TypeError: Error #1010: A term is undefined and has no properties. at FYPFinalresize3_fla::MainTime

Can anyone help me please....

i have 13 scenes in my adbe animate project where scene 8-12 is video animation sscene, meanwhile 1-7 is static scene with button. on scene 3,4,5,6,7. i put a button to navigate into scene 8-12. however when the button (in scene3-7) are cliched, the whole video animation scene are freezin. either animation and buttons don't wwork on scene (8-12)

i did enable permit debugging. and it only show

TypeError: Error #1010: A term is undefined and has no properties.
at FYPFinalresize3_fla::MainTimeline/frame307()[FYPFinalresize3_fla.MainTimeline::frame307:188]
at flash.display::Sprite/constructChildren()
at flash.display::Sprite()
at flash.display::MovieClip()
at flash.display::MovieClip/gotoAndPlay()
at FYPFinalresize3_fla::MainTimeline/fl_ClickToGoToScene_1002()[FYPFinalresize3_fla.MainTimeline::frame302:48]

i dont know where is the mistake. it said the problem in 307, but in which scene? i checked all the scene but i didnt put any code to that frame. please help me ass soon as possible. i have been stuck for days in this error