conda无法下载所需要的包

(base) C:\Users\Lenovo>conda install -c bioconda gemma
Collecting package metadata (current_repodata.json): done
Solving environment: unsuccessful initial attempt using frozen solve. Retrying with flexible solve.
Collecting package metadata (repodata.json): done
Solving environment: unsuccessful initial attempt using frozen solve. Retrying with flexible solve.

为什么conda安装不了呢?

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