Не загружается excel файл в программу R Studio

y <- read.table("PopularIndicators2.xlsx", header = TRUE, sep = ",",
                           comment.char = "", fill = TRUE, check.names = FALSE,
                           blank.lines.skip = TRUE)

Выдает ошибку:

Warning messages:
1: In read.table("PopularIndicators2.xlsx", header = TRUE, sep = ",", :
line 1 appears to contain embedded nulls
2: In read.table("PopularIndicators2.xlsx", header = TRUE, sep = ",", :
incomplete final line found by readTableHeader on 'PopularIndicators2.xlsx'