[ESS] ESS 14.09 File mode specification error

[Georg Otto]

Dear all,

I upgraded ESS to version 14.09 and now I receive an error message when
opening a file file.R containing R code.

$ emacs test.R

The error message is:

File mode specification error: (wrong-number-of-arguments
called-interactively-p 1)

In addition, the test.R file is not recognized properly. However, R
processes run correctly in ESS

Any idea what is going on?

Best wishes,

Georg