It's just a warning so you could change Joomla error level to "none" in global configuration. Alternately downgrade PHP version.
Regards, Mark.
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Those are the only two solutions that I am aware of.
Regards, Mark.
Please search forums before posting. Please make sure your post includes the version of the CMS you are using and a link to the problem. Annotations on screenshots can also be helpful to explain problems/goals. Please use the "secure" tab for confidential information.