This happens if you are editing a views box with a referred title with more than 128 chars, created after applying the patch from here: Limit the length of the returned label to 128 chars.
The issue is that core default textfield max length is 128 chars: element_default_values.
To avoid this, the previos mentioned patch was created for entity_autocomplete, the module that provides title matching autocompletion, while editing the argument value, but after the box is saved and edited back the argument textbox was populated with the full title, producing the same validation error again when saved.
This issue may be related to: Enter button on settings selection fails to save changes to box
Attached is a patch that should take care of this. It must be applied together with the path on entity_autocomplete mentioned here.

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#1 arg_title_length_128_limit-1439008-1.patch828 bytesfxarte
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fxarte’s picture

This is the patch.