Transient feeds and caching error

Since you mentioned that this is only happening on certain environments then a possible cause could be that those servers do not have the proper PHP extensions installed to handle parsing XML.

Here’s a great Stack Exchange answer that outlines most (if not all) of the required extensions.

Specifically, I would confirm whether or not SimpleXML and XML Parser are installed and functioning properly. Maybe use a phpinfo plugin to check that quickly.

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