I suppose you already resolved the issue.
For anyone interested, such error can occur if jQuery is not loaded or if it is loaded more than once on the page. Also the viewer's JS file must be loaded in order to create the viewer object.
Details about the minimum requirements for JS and CSS resources on the page - HTML5 Viewer Requirements
. The recommended troubleshooting approach is to use Fiddler or other proxy tool to check the requests, their responses and statuses. Information about requests and responses content can be seen in Fiddler - Inspectors - Request/Response - Raw tabs. This will let you check requests to the Reporting REST service and if the URLs are correct (if relative paths are resolved correctly).
Relative paths may need adjustment depending on how the application is hosted.
I hope this information is helpful.
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