Error enabling the designer mode on 4.0.10.2

[Husky_Jim]

I tried to enable the designer mode in 4.0.10.2 (it was working before the upgrade) and i received the error attached.
Since it is not pointing to the full 'themes' path could anyone tell me in which folder do i need to create or give permissions to the themes folder?

 

Thanks in advance,

Dimitris

[Husky_Jim]

Found it!