我想把pem格式的证书转成der格式，操作之后报如下错误，请问怎么解决啊
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[已关闭问题]
关闭于 2014-03-04 16:36
c:\openssl>openssl x509 -in cert.pem -inform PEM -out cert.der -outform DER
unable to load certificate
8112:error:0906D06C:PEM routines:PEM_read_bio:no start line:.\crypto\pem\pem_li
.c:648:Expecting: TRUSTED CERTIFICATE
c:\openssl>
