Fatal error: Call to undefined function

[justj03]

I don’t think I’ve made any changes to my site, but I’m now receiving an error when someone clicks on the form link:


Fatal error: Call to undefined function mb_strlen() in /home/.../wp-content/plugins/iphorm-form-builder/includes/CSSParser/CSSParser.php on line 25

Can you offer any suggestions or advice?

[Allan]

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