Windows 10 Mail with Zoho.com gets 0x80072726 error

You should use IMAP with receiving server imappro.zoho.com instead of poppro.zoho.com. 

undefined method named "setFormTheme" in SonataAdminBundle

Your class needs to be extended like this:

class CategoryAdmin extends Admin{

}

Symfony {urn:oasis:names:tc:xliff:documen t:1.2}br not expected

You can get the same error like me:
[Symfony\Component\Translation\Exception\InvalidResourceException]
  Invalid resource provided: "1.2"; Errors: [ERROR 1871] Element '{urn:oasis:names:tc:xliff:documen
  t:1.2}br': This element is not expected. Expected is one of ( {urn:oasis:names:tc:xliff:document:
  1.2}g, {urn:oasis:names:tc:xliff:document:1.2}bpt, {urn:oasis:names:tc:xliff:document:1.2}ept, {u
  rn:oasis:names:tc:xliff:document:1.2}ph, {urn:oasis:names:tc:xliff:document:1.2}it, {urn:oasis:na
  mes:tc:xliff:document:1.2}mrk, {urn:oasis:names:tc:xliff:document:1.2}x, {urn:oasis:names:tc:xlif
  f:document:1.2}bx, {urn:oasis:names:tc:xliff:document:1.2}ex ). (in /var/www/rgk.lv/rgk-symfony/
  - line 12, column 0)

It solves by adding string in composer.json:

"geschke/translator-gui-bundle": "dev-master"

And doing composer update

RouteNotFoundException "lexik_translation_new" as such route does not exist

Do not forget make changes in files:

• *.html.twig
• Config/routing/routing.yml
• Config/routing/app.yml

Especially in the second, do not forget to add there these lines:

lexik_translation_edition:    resource: "@LexikTranslationBundle/Resources/config/routing.yml"    prefix: /translations/grid