[R] PROBLEMS with In `[<-.factor`(`*tmp*`, (¿ORDERED FACTOR?)

[RBB]

HI!!!

I have a table containing qualitative and quantitative data; one of the
columns contains  "Level of education", and the possibilities are "none",
"High school", "college"; I want to give the value 0 to "none", the value 1
to "High school", and 2 to "college", but I got the following error: 

In `[<-.factor`(`*tmp*`, educa = "college", value = 2) :
  invalid factor level, NAs generated


WHAT IS WRONG????? :S :S :S 


THANKS A LOT!!!!!!!!!!!!!!

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