I've got a local installation of ExpressionEngine 3 and I'm trying to install an add-on to allow me to customise the control panel CSS.
I've tried the following add-ons but after installing and when trying to access the add-on in the control panel I'm presented with the following errors. It's done the same thing for both add-ons making me think it's not an issue with the add-ons:
https://devot-ee.com/add-ons/digi-nut-control-panel-css-js gave the following error: Error: Unable to load the requested language file: language/english/dn_control_panel_css_js_lang.php
https://devot-ee.com/add-ons/cp-css gave the following error: Error: Unable to load the requested language file: language/english/cpcss_lang.php
Any suggestions will be very welcome,
Thanks in advance,