You need to provide some more specific information. Lightroom does not use any "Photoshop" plug-in's, only plug-in's specifically designed for Lightroom.
Am facing little problem with lightroom.I can't edit my picture in photoshop through lightroom when i choose photo and go down in option menu and select edit in photoshop...the photoshop option appearing in Gray colour witch means i can't select that option.so what should i do ?
As I said in my earlier post you need to supply some more specific information. e.g. What operating system are you using? What version of Lightroom are you using? What version of Photoshop are you using? Was it working before? Did this problem start when you updated your system? Are you using the Creative Cloud?
If your issue is Edit In not working, rather than the Camera Raw plug-in missing, then try these things:
Lightroom FAQ (Frequently Asked Questions) (edit in stops working)
Someone else said that they were using Smart Previews and not originals and the Edit In fails, meaning you can't use Smart Previews with LR with the originals disconnected and expect to use Edit In PS.