'Error when trying to Pkg.add("Playground") in Julia

I am trying to install Playground in Julia 1.7.2 in order to make a virtual environment. However, when I go about julia> Pkg.add("Playground") the following error appears:

ERROR: The following package names could not be resolved:
 * Playground (not found in project, manifest or registry)

I am not sure what is happening and how to properly resolve this issue in the most convenient way. Could it be a version incompatibility issue?



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