[BioC] Error in .testGOFrame(x, organism)

[omranian]

Hello,

Can anybody help me to solve this error?  I can not understand it :(

  library(org.Sc.sgd.db)
  frame <- toTable(org.Sc.sgdGO)
  goframeData <- data.frame(frame$go_id, frame$Evidence, 
frame$systematic_name)
  goFrame <- GOFrame(goframeData, organism = "Saccharomyces cerevisiae")
Loading required package: GO.db

Error in .testGOFrame(x, organism) :
   All of the Evidence codes in your data.frame object must be 
legitimate Evidence Codes.

Thanks a lot.
Nooshin