Very odd error indeed. Is the only page where you get the errors on administration/infusions.php?
From what I can think of there can only be two possible solutions.
1. For some reasons your administration/infusions.php page was not correctly updated. Please download the one I have attached in this thread and see if it solves any of your errors.
2. Some of your infusions in your infusions folder are causing the error. Try removing them all and see if error disappears. Try putting one back at a time and see if any trigers the error.
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