Here is my problem. I've added an instance of a low-leakage nmos in the layout editor using 'Add Instance' menu. Now, that instance makes use of a layer called 'CPH'. However, the layer is written in red text in the LSW. And whenever I click on it, the following error message appears:
*WARNING* (LE-104017): The entry layer cannot be set to (CPH drawing) because this layer-purpose pair does not exist in the LSW (or the Layers assistant). Ensure that the layer-purpose pair has not been set to be excluded from the LSW.
Same happens when I click on that layer in the layout editor. So, once the instance has been added, I cannot move around this particular layer. Can somebody help me tackle this situation? Why could this be happening?