Uncaught TypeError: Cannot read property 'length' of null
    at constructor.getErrors (ext-all-debug.js:198083)
    at constructor.getErrors (ext-all-debug.js:7228)
    at constructor.getErrors (Externalizable.js:360)
    at constructor.getErrors (ext-all-debug.js:7228)
    at constructor.validateValue (AbstractField.js:269)
    at constructor.isValid (AbstractField.js:185)
    at ext-all-debug.js:187366
    at constructor.findBy (ext-all-debug.js:45805)
    at constructor.hasInvalidField (ext-all-debug.js:187362)
    at constructor.checkValidity (ext-all-debug.js:187398)