From a support perspective, we almost always have to go to the logs to find root cause of a 30270 error code. The error code means that an error has occurred while processing the data provider for your document. If you have multiple data providers, you can try making a copy of your report for testing purposes and removing them one at a time to see if/when the error goes away. Once you identify the data provider that is failing, you can narrow it down from there.
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