built in water shader not woking

i am applying water shader it is pink what to do

Which water shader are you using? Are there any errors in the debug window?

there are no errors i am using shader that are imported with unity 5 environment assets

Which one? There are at least 3.

all of them do this water basic , water4 etc all of them do this

This is either an error because of an unassigned shader or an error within the shader. If it’s a problem with the shader, I’m not entirely sure what it would be.