After the default instance setup on EC2 (V6.4.0), a simple sample visualize.js example with an exisiting ad-hoc report failed (also on jsfiddle).
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OK, ad-hoc reports are currently not supported. But with basic reports the problem remains. It turns out, that the exception occurs if the code is embedded in an HTML file. In jsfiddle it works as expected.
I found the answer here https://community.jaspersoft.com/documentation/tibco-jasperreports-serve...