Then, the following message id displayed on the "output" tab on the timeline:
An unexpected error occurred during export. [JSX]
Warnings generated while copying/importing in .TMP.fla:
* Quality, Knockout, Inner Shadow and Hide object of DropShadow Filter is not supported in HTML5 Canvas document, and has been removed in an instance of Movieclip <Path>_50.
Should I change the document type that I am using?
create a new canvas project and test. any problem?
if not start adding assets/code from your problematic project until you find the corrupted asset/problem.