cannot view the certificate in a pem file converted from pkcs12 file, exported from NSS database with pk12util command.

Issue

• I created a CA certificate, a service certificate, and those private keys into a NSS database with certutil command.
• I saved the CA certificate with PKCS12 format with pk12util command.

# pk12util -o cacert.p12 -n "CA Certificate" -d . 

• I converted it into pem format with openssl pkcs12 command.

#  openssl pkcs12 -in cacert.p12 -cacerts -aes128 -out cacert.pem

• Then, I tried viewing the .pem file with openssl x509 command, but it failed with the following error.

# openssl x509 -in cacert.pem -text -noout
unable to load certificate
139773134608288:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:703:Expecting: TRUSTED CERTIFICATE