There would appear to be some error with the use of button
code in the layer called button, possibly for something that is not
a button, or possibly the code is placed somewhere that it should
not be placed.
Can you describe what objects live in the button layer?
Is there any frame on that layer that appears to have
actionscript in it (a lower case "a" looking thing displays in the
timeline frame itself)? That would be a potential suspect.