cslam: Cannot locate rosdep definition for [rtabmap]

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Hello.

I am installing Swarm-SLAM and I successfully install all the dependencies. But when I run "rosdep install --from-paths src -y --ignore-src --rosdistro foxy", i get this error:

ERROR: the following packages/stacks could not have their rosdep keys resolved to system dependencies: cslam: Cannot locate rosdep definition for [rtabmap]

Can you tell me why it shows this error. Note: I have already build rtabmap in my home/Downloads folder.