Cubemap readable

Hi.
I created a shader with a cubemap. Apparently I unchecked the readable checkbox in the cubemap inspector.  When I re-opened the shader shaderforge I got this error ;
UnityException: Texture 'Cube_SwimmingPool' is not readable, the texture memory can not be accessed from scripts. You can make the texture readable in the Texture Import Settings.
Then shaderforge crashed the material ingame turned black.(uncompiled I guess)and when reopening the shader in Shader Forge (with the cubemap readable checkbox on) all my nodes where disconnected..