Thank you for posting this question in a discussion forum.
In an attempt to help you resolve this issue, allow me to ask a couple of questions. First of all, where is it that you are attempting to delete the Read method? You mentioned that the delete option is grayed out - is this within a project explorer or some other environment? Secondly, you mentioned that the VI under the class in the project says "Cannot find file." Which VI, in particular, are you speaking of? And are you wanting to completely delete the method, or simply remove something from a project explorer window for the future?
It would be very helpful if you could capture a screenshot or two of the behavior that you're experiencing - this way we'd have a better idea of exactly how you're wanting to delete the method and where the hang-up is.
Thank you so much again for the question, and we'll hopefully find a solution quickly!
Peter
Peter L.
Applications Engineer
National Instruments
www.ni.com/support/