My current substrate node version is 4.0.0-dev.
And I am going to add offchain worker function on my current node project.
I have added the ocw-demo pallet on pallets folder.
And then, when I run the cargo check , I am getting this error.

How can I solve this problem?
Where can I find the exact version of ocw-demo pallet for substrate version "4.0.0-dev" ?
Please help me!!!