OpenSSL encoding errors while converting cer to pem

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http://stackoverflow.com – I`m trying to convert the .cer file to .pem through openssl, the command is: openssl x509 -inform der -in certnew.cer -out ymcert.pem and that's the errors I`m getting: unable to load certificate 140735105180124:error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag:tasn_dec.c:1319: 140735105180124:error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error:tasn_dec.c:381:Type=X509 What am I doing wrong? (HowTos)