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The Free versions WProofreader work in the CKEditor 4 requires turning off the SCAYT plugin. A free version of SpellCheckAsYouType (SCAYT) product is provided as a plugin, which integrated by default in CKEditor WYSIWYG editor. To into the CKEditor WYSIWYG editor. To remove the SCAYT plugin from CKEditor 4 you need to add , add the following line to your CKEditor config.js file: 

config.removePlugins = 'scayt';

If you want to leave SCAYT available, but prevent the feature Set the config.scayt_autoStartup configuration setting as false  to prevent SCAYT from being turned on automatically on loading the editor, set the config.scayt_autoStartup configuration setting to false. This is the default value for CKEditor configuration. In this case, the SCAYT plugin for CKEditor 4 is available but turned off.

config.scayt_autoStartup = false;