background part disappears when exported

[Emily30264755x3gy]

It seems very normal on the frames, and works so well, but when exported, background ground part suddenly disappears ;-; 

I tried to make new layers and make another ground part, but it shows about 1 seconds and

still only this part disappears...

How can I solve this problem?

[Emily30264755x3gy]

I think I solved the problem by adding more frames in walking symbol 

[kglad]

for others,

if you use a graphic symbol, the main timeline must have enough frames to play, after the graphic symbol appears, to display the symbol's full timeline.

[Nicktendo28]

Glad you got it figured out.