I can't get Incoming changes Even I can't check-in my work of unity project.

When I tried to check in my work of unity project it shows this Plastic SCM cloud error “you can’t get new changes (Incoming Changes)because you need to check the current merge first. You can check in your changes to a new branch or alternatively merge from the last changeset of the branch” In the last few days to resolve the error of “evil twin conflicts,” I applied “subtractive merge” but didn’t remember whether I have checked in that work or not. Is this happened because of it? I couldn’t understand how to sort out this error. If anybody would help me on it.

I sorted out the issue of check-in my work. I selected the option from the merge option “ignore traceability” and then I did the check-in operation, and it is done successfully in the new branch. but my team members checked in some changes last Friday which I didn’t get yet. so what I should do in order to resolve it also