MediaWiki:Apihelp-options-param-optionvalue
The value for the option specified by $1optionname. When $1optionname is set but $1optionvalue is omitted, the option will be reset to its default value.
Whoops! The default skin for your wiki, defined in $wgDefaultSkin as SkinMinerva, is not available.
Your installation seems to include the following skins. See Manual: Skin configuration for information how to enable them and choose the default.
cologneblue / CologneBlue (enabled)minervaneue / MinervaNeue (disabled)modern / Modern (enabled)monobook / MonoBook (enabled)timeless / Timeless (disabled)vector / Vector (enabled)chameleon / chameleon (enabled)skins/ directory from it.LocalSettings.php to enable all installed skins:wfLoadSkin( 'MinervaNeue' ); wfLoadSkin( 'Timeless' );
LocalSettings.phpThe value for the option specified by $1optionname. When $1optionname is set but $1optionvalue is omitted, the option will be reset to its default value.