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[ctgraham]

This indicates that your webserver cannot write to the cache folder. See this thread on setting up your file permissions:

How should file permissions be set?

Dear everyone, I have been searching this subject for a few days but could not get a straight forward answer. While installation of OJS, the permission of config file, Public folder and chache folder is set to 777. What should be the permission of these files/folders once the installation is complete. Regards @anupent