Why the error is coming? even though the length of outcome.new$compkey and outcome.new$armkey were exactly same.
Can anyone help?

setwd("D:/AZ")
library("RODBC")
cdb_cnct <- odbcConnectExcel("AZIF_DC_GVK_NSCLC_MSALL_287papers_02072012_141450_v1_4.xls")
outcomes <- sqlFetch(cdb_cnct, "Outcomes_info")
odbcClose(cdb_cnct)
rm(cdb_cnct)
sink("Dependency checks.log")
outcomes[(outcomes$Comparator != 9999), ] -> outcome
compkey <- paste(outcome$Comparator, outcome$Comparator_Subarm, sep='_')
armkey <- paste(outcome$Arm_ID, outcome$SubArm_ID, sep='_')
outcome.new <- cbind(outcome, compkey, armkey)
invalid.ids <- outcome.new[outcome.new$compkey == outcome.new$armkey, c("Assessment_record_ID")]

Error in Ops.factor(outcome.new$compkey, outcome.new$armkey) :
  level sets of factors are different


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