When copying and pasting text, some operating systems may change quotation marks to letter quotes. The difference is hard to see, but it makes a big difference.
Quote marks get changed from " to " or “.
In the web environment, these quote marks are seen as invalid characters, breaking any code they appear within. The correct quote marks are used to define a value for an option or property.
How To Fix It
Request a test link and double check the marks. Alternatively, you can use the updated Adcanvas tag.
The new tag format is protected against the quote mark error.
You can view this error in the Chrome Developer Inspect Console fairly easily.