Errors on activation

I am trying to use this plugin for both a regular installation and a multisite installation of WordPress.

I’d love to use it, any advice on fixing these errors:

Stand-alone installation:
The plugin generated 2 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

Multisite error:
Warning: Creating default object from empty value in /home/marketsm/public_html/wp-content/plugins/jquery-color-picker/jquery-color-picker.php on line 101

https://www.ads-software.com/plugins/jquery-color-picker/