ODOO update problem:

Odoo was very outdated. When we update it, we can't get the web_editor module to update, it returned a fault.

Part of the /static/src/js/wysiwyg/root.js file previously said:

publicMethods: ['isDirty', 'save', 'getValue', 'setValue', 'getEditable', 'on', 'trigger', 'focus'],

Now: 

publicMethods: ['isDirty', 'save', 'getValue', 'setValue', 'getEditable', 'on', 'trigger', 'focus', 'saveCroppedImages']

In order to update the web_editor module, we first had to update modules that depend on it, such as Stock or Account.

That solved the problem, we were able to update web_editor and the 

Error: instance [methodName] is undefined 

did not appear again when we clicked on an element of a list.