SMIME SIGN MESSAGE - PLEASE HELP ME

[Ivo MACHULDA]

Hello all, I tray signing simple text file over openssl tool with thi comand:   /usr/local/ssl/bin/openssl smime -sign -in mail.txt -text -out mail.msg -signer user.pem   This comand write this error:   Can't read recipient certificate file user.pem 13916:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:662:Expecting: ANY PRIVATE KEY     Please help me   Thank you very much   Ivo MACHULDA