[R-meta] double arcsine transformation

I am performing a univariate meta-analysis on sensitivity and specificity.   I
fit the model in metafor and when trying to transform the double-arcsine I get
the following error:

 pes<-predict(pes.dat,transf.ipft.hm,targ=list(ni=dat$total))
Error in predict.rma(pes.dat, transf.ipft.hm, targ = list(ni = dat$total)) : 
  Cannot specify new moderator values for models without moderators.

Is this fixable or do you need more information.

James C Meyer DVM DACVIM