[R] warning in summary(aov())

[Jhope]

Hi R-listers,

I am receiving an error - see below. Aeventexhumed is the event in which
nesting occured, so it is defined by A, B, C. I thought as a factor was ok,
tried to change it to as.character but it still gave me the same error. Is
there something I should do about this error or just ignore it? 

Please advise, Jean

>summary(aov(EDI ~ HTLIndex + Aeventexhumed + HTLIndex:Aeventexhumed,
data=data.to.analyze))

                       Df  Sum Sq Mean Sq F value Pr(>F)
HTLIndex                6   2.435 0.40575  0.2027 0.9752
Aeventexhumed           2   4.652 2.32601  1.1619 0.3172
HTLIndex:Aeventexhumed 11   7.941 0.72192  0.3606 0.9680
Residuals              98 196.193 2.00197               
5 observations deleted due to missingness
Warning message:
In model.matrix.default(mt, mf, contrasts) :
  variable 'Aeventexhumed' converted to a factor



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