[plt-scheme] on 371, requiring SRFI 19 yields an error

$ mzscheme --no-init-file --mute-banner --version --eval '(require (only (lib "19.ss" "srfi") date->string current-date))'
module: identifier already provided at: current-language in: (rename provide/contract-id-current-language current-language)
-- 
"I said, `Shut up!' " Ms. Glass recalled ... " `You do not!
Oh my God! Oh my God! Oh my God!' So I went to Nina, my boss, and
said, `Oh my God! Oh my God! Oh my God!' "

        --- Julie Salamon, in the New York Times