[build] Error: Unable to find source space `/opt/ros/noetic/src`

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Hey guys,

I made a blunder! I used build my packages and somehow I was unable to clean them, so I deleted build, devel folders. Now I can't build them. It throws the above error. Is there anyway to fix this?

@getpc14:~/ros> ls

build packages

@getpc14:~/ros> catkin build

[build] Error: Unable to find source space #######/ros/src

@getpc14:~/ros>