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The code generated for the iframe doesn't pass the w3 validator - apparently the width attribute is not supported:
Line 374, Column 94: general entity "width" not defined and no default entity
This is usually a cascading error caused by a an undefined entity reference or use of an unencoded ampersand (&) in an URL or body text. See the previous message for further details.
Removing the width param from the iframe makes no difference to the data returned, can probably just remove it.