Conda 不创建环境 (ResolvePackageNotFound)

Question

我正在尝试创建一个 conda 环境。 这是我拥有的 yml 文件：

name: py3_pygeos 
channels:
- conda-forge             
dependencies:             
- nbformat=5.1.2             
- scipy=1.1               
- pillow=8.1.0              
- cairo=1.14              
- ipython=7.11.0             
- numpy=1.19.2            
- python=3.8.1            
- matplotlib=3.0          
- jpype1=0.6.3            
- pyarrow=0.11            
- jedi=0.18.0               
- python-dateutil=2.8     
- pandas=0.23.4             
- libiconv=1.15           
- asammdf=5.19.14         
- affine==2.3.0           
- attrs==20.2.0           
- backcall==0.2.0         
- certifi==2020.6.20      
- chardet==3.0.4          
- click==7.1.2            
- click-plugins==1.1.1    
- cligj==0.5.0            
- decorator==4.4.0        
- Fiona==1.8.17           
- Flask==1.1.2            
- geographiclib==1.50     
- geopandas==0.8.1        
- geopy==2.0.0            
- geos==0.2.2             
- idna==2.8               
- ipykernel==4.8.2        
- ipython-genutils==0.1.0 
- itsdangerous==1.1.0     
- Jinja2==2.11.2          
- jupyter-client==6.1.11  
- jupyter-core==4.7.1     
- lxml==4.5.2             
- MarkupSafe==1.1.1       
- munch==2.5.0            
- numpy==1.19.2           
- pandas==0.23.4          
- parso==0.7.1            
- pexpect==4.7.0          
- pickleshare==0.7.5      
- prompt-toolkit==3.0.8   
- ptyprocess==0.6.0       
- pygeos==0.8             
- Pygments==2.7.1         
- pyparsing==2.4.7        
- pyproj==2.6.1.post1     
- python-dateutil==2.8.0  
- pytz==2019.2            
- pyzmq==18.0.2           
- rasterio==1.1.7         
- requests==2.22.0        
- Rtree==0.9.4            
- Shapely==1.7.1          
- simplegeneric==0.8.1    
- six==1.15.0             
- snuggs==1.4.7           
- tornado==5.1.1          
- traitlets==4.3.2        
- urllib3==1.25.10        
- wcwidth==0.2.5          
- Werkzeug==1.0.1         

当我运行时：

conda env create --file=py3_pygeos.yml

我收到此错误：

Collecting package metadata (repodata.json): done
Solving environment: failed

ResolvePackageNotFound:
   - ipython-genutils==0.1.0
   - jupyter-client==6.1.11
   - jupyter-core==4.7.1
   - geos==0.2.2

错误中包的版本似乎是有效的：

• https://pypi.org/project/ipython_genutils/#history
• https://pypi.org/project/jupyter-client/#history
• https://pypi.org/project/jupyter-core/#history
• https://pypi.org/project/geos/#history

我试图将错误中的包降级到下面的一个版本，但得到了相同的结果。

为什么找不到包？