unmet dependencies error when installing m2ee-tools on Debian 11

I get the error message : "The following packages have unmet deoendencies: python-m2ee : Depends: python-yaml but it is not installable                             Depends: python-httplib2 but it is not installable E: unable to correct problems, you have held brocken packages." when I install m2ee in Debian 11, 
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