Can't install new theme
I’ve installed a new theme and it seemed to be ok but opening site, appears what follows:
Fatal error: Call to undefined function mb_strtoupper() in D:\Inetpub\webs\mydomain\wp-content\themes\grey-opaque\includes\classes.php on line 227
This is what line 227 says:
$var_sUpperString = mb_strtoupper($var_sString, ‘utf-8’);
Do you guys know what to do? Thanks in advance
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