before freeradius, openssl don't work

[pelusa vali]

hi everybody, well still trying to use freeradius for a wlan.  i use debian 
sarge kernel 2.6.13, openssl 0.9.8.a to generate certificates and last 
freeradius version.
well i followed many tutorials about securing wlans with freeradius and all 
of them have this step:

openssl rsa <newreq.pem >  servidor-key.pem

but when i type this my system returns:

unable to load Private Key 5237:error:0906D06C:PEM routines:PEM_read_bio:no 
start line:pem_lib.c:644:Expecting: ANY PRIVATE KEY

so i think it's a problem with rsa generation and tried to generate rsa key 
but always get same error.

i know it's not a list of openssl but i posted this question in openssl list 
and nobody ask; searched in internet and nothing; so, any body could help?? 
what is happening and how could i solve this?? excuse if this so trivial but 
i'm new with both, openssl and freeradius and don't understand what is 
happening and why.

thanks in advance for your time and help.

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