执行生存分析时出现log2问题

Question

我打算使用TCGAbiolinks使用以下代码执行生存分析：

library(TCGAbiolinks)
library(SummarizedExperiment)
query_RNAseq <- GDCquery(project = "TCGA-PAAD",
                         data.category = "Gene expression",
                         data.type = "Gene expression quantification",
                         platform = "Illumina HiSeq", 
                         file.type  = "results",
                         experimental.strategy = "RNA-Seq",
                         legacy = TRUE)
GDCdownload(query_RNAseq, method = "api",chunks.per.download = 10) 
PAADRnaseqSE <- GDCprepare(query_RNAseq)

# Survival Analysis SA
clinical_patient_Cancer <- GDCquery_clinic("TCGA-PAAD","clinical")
dataPAADcomplete <- log2(PAADRnaseqSE)

但是当我运行log2函数时出现错误，代码和错误信息被粘贴在

下面

> dataPAADcomplete <- log2(PAADRnaseqSE)
Error in log(<S4 object of class "RangedSummarizedExperiment">, 2) : 
  unused argument (2)

我该怎么做才能解决问题？