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Regardless of what the PHP error implies, I have narrowed down the problem to be a direct conflict between excal and the most recent verion of WF-Downloads.
Whenever I attempt to enable any of excal's blocks on a page that has WFDownload related code I get a blank white page.
Depending on which block I try to enable, I get a different error message.
Anyone have a suggestion for further troubleshooting this problem?