'Make a pfx file from crt, pem, and p7b

I have a crt file, a pem file, and a p7b file but I need a pfx file.

$ openssl pkcs12 -export -out certificate.pfx -inkey 107b71814d61e7ba.pem  -in 107b71814d61e7ba.crt
unable to load private key
140339680056640:error:0909006C:PEM routines:get_name:no start line:../crypto/pem/pem_lib.c:745:Expecting: ANY PRIVATE KEY
$

Any ideas?



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