Can't activate solution after fresh cloning from Git repo

I get the following error after doing a fresh Git clone. What causes this problem?

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Up until Servoy 7.2 the actual files that are part of your solution should be located inside the project directory of Eclipse and the default GIT way is to have them live in your GIT repository and in your Eclipse workspace just have the project directory and Eclipse will read the actual files from the GIT repository.

Servoy 7.3 adds the needed support to work with the default GIT way of working (SVY-4567). Until 7.3 becomes available, the only solution it to put your git repo inside your workspace, which is not ideal.

Paul