Hello, I got stuck here. Could I get any help?

LSD_AB = LSD.test(y = YIELD,

•               trt = IRR*NITRO,
  

•               DFerror = aov.res$df.residual,
  

•               MSerror = deviance(aov.res)/aov.res$df.residual,
  

•               alpha = 0.05,
  

•               p.adj = "bonferroni",
  

•               group = TRUE,
  

•               console = TRUE)
  

Error in IRR * NITRO : non-numeric argument to binary operator

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