R软件进行TwoSampleMR进行代码运行时，bmi_exp_dat_clumped<-read_exposure_data(filename = bmi,snp_col = "SNP",effect_allele_col = "effect_allele",other_allele_col = "other_allele",eaf_col = "eaf",beta_col = "beta",se_col = "se",clump = TRUE)，出现文件报错“输入是空的或只有字节顺序标记（BOM）或终端控制字符”
请问这怎么解决？