R中运行函数enrichPathway报错character(0)Failed with error: ‘‘package‘的长度必需为一’?

R中运行函数enrichPathway报错character(0)Failed with error: ‘‘package‘的长度必需为一’?

R中运行函数enrichPathway时报错如下

>reactome = enrichPathway(genes$ENTREZID,organism = "mmu",pvalueCutoff = 1)
character(0)
Failed with error:  ‘'package'的长度必需为一’
?

解决方法，查看help文档，将organism参数值改为mouse