R语言，用moddicom包查看DICOM格式数据，显示XML content does not seem to be XML: ''

R语言，用moddicom包查看DICOM格式数据，显示 错误: XML content does not seem to be XML: ''

library(moddicom)
setwd("D:/Rdocument/radiomics/test/Images/")
obj.geolet <- geoLet()
obj.geolet$openDICOMFolder(pathToOpen= "./PAT1")
错误: XML content does not seem to be XML: ''
到底哪儿出错了 哪位大佬能解释一下。
路径都对啊。