[R] Error message in as.brob Usage

[HC]

I am getting the following error message while using the as.brob function in
some computations:

Error in out.x[ss] <- pmax(x1[ss], x2[ss]) + log1p(+exp(-abs(x1[ss] -  : 
  NAs are not allowed in subscripted assignments

Is there any obvious mistake I am making here that can resolve the above
error message?

Thanks for your help.
Chow
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