Ensembl site unresponsive when using creat_cellphonedb_file() function

[pandaqiuqiu]

When I use the creat_cellphonedb_file() function to generate the input files for CellPhoneDB, I encountered the following error:

creat_cellphonedb_file(sce, Sample)

Ensembl site unresponsive, trying asia mirror Ensembl site unresponsive, trying asia mirror Error: biomaRt has encountered an unexpected server error. Consider trying one of the Ensembl mirrors (for more details look at ?useEnsembl)

Additionally, I am curious why this process needs to call biomaRt. Any response will be appreciated.