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nlme augPred problem

PIKAL Petr 
Dear all

I encountered strange behaviour of augPred with virtually the same data

Firs I made groupedData object.
When I perform nlme on complete dataset I get an error with augPred
Warning message:
c("1 error caught in nls(y ~ cbind(1 - exp(-exp(lrc) * x), exp(-exp(lrc) * x)), data = xy, : singular gradient", "1 error caught in     start = list(lrc = lrc), algorithm = \"plinear\"): singular gradient")
Error in `[[<-.data.frame`(`*tmp*`, nm, value = c(6L, 6L, 6L, 6L, 8L,  :
  replacement has 60 rows, data has 12

However when I make subset of my data
Warning message:
c("1 error caught in nls(y ~ cbind(1 - exp(-exp(lrc) * x), exp(-exp(lrc) * x)), data = xy, : singular gradient", "1 error caught in     start = list(lrc = lrc), algorithm = \"plinear\"): singular gradient")
augPred works as a charm. Does anybody know where I should try to search for problems?

Best regards
Petr
_
platform       x86_64-w64-mingw32
arch           x86_64
os             mingw32
system         x86_64, mingw32
status         Under development (unstable)
major          3
minor          5.0
year           2017
month          07
day            31
svn rev        73003
language       R
version.string R Under development (unstable) (2017-07-31 r73003)
nickname       Unsuffered Consequences
Package nlme version 3.1-131

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