The paddingX style is not available for Canvas. Use marginX style for the children instead.
Ex: paddingTop="5" set on Canvas, delete it and set marginTop="5" on the child you want to have the padding applied to.
I had the same problems and i have corrected them by deleting paddingTop="0" because changing it to marginTop="0" only created more errors but when i delete paddingtop="0" i get the following error:
Description Resource Path Location Type
1151: A conflict exists with definition _typeRef1 in namespace internal.
This is the complete line:
internal var _typeRef1:mx.effects.Fade;