conda install flexbar error

[GuangyaoL]

hi，sir：
when I used to install flexbar by command "conda install -c bioconda flexbar ",the error
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: |
Found conflicts! Looking for incompatible packages. failed

UnsatisfiableError: The following specifications were found to be incompatible with each other:

Output in format: Requested package -> Available versions

Package libgcc-ng conflicts for:
flexbar -> libgcc-ng[version='>=7.3.0']
flexbar -> zlib[version='>=1.2.11,<1.3.0a0'] -> libgcc-ng[version='>=7.2.0']
python=2.7 -> libgcc-ng[version='>=7.2.0|>=7.3.0']