apache2 won't start cause ssl : "Failed to configure encrypted (?) private key"

Question

I just created a ssl certificate shown here : http://www.tecchannel.de/a/owncloud-9-unter-ubuntu-server-16-04-lts-installieren,3277807,2

now if I start apache I get no error but with service apache2 status I get a error , error log :

[Fri Mar 31 14:55:59.639400 2017] [ssl:error] [pid 21071] AH02579: Init: Private key not found
[Fri Mar 31 14:55:59.639479 2017] [ssl:error] [pid 21071] SSL Library Error: error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag
[Fri Mar 31 14:55:59.639494 2017] [ssl:error] [pid 21071] SSL Library Error: error:0D08303A:asn1 encoding routines:ASN1_TEMPLATE_NOEXP_D2I:nested asn1 error
[Fri Mar 31 14:55:59.639504 2017] [ssl:error] [pid 21071] SSL Library Error: error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag
[Fri Mar 31 14:55:59.639515 2017] [ssl:error] [pid 21071] SSL Library Error: error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error (Type=RSA)
[Fri Mar 31 14:55:59.639526 2017] [ssl:error] [pid 21071] SSL Library Error: error:04093004:rsa routines:OLD_RSA_PRIV_DECODE:RSA lib
[Fri Mar 31 14:55:59.639536 2017] [ssl:error] [pid 21071] SSL Library Error: error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag
[Fri Mar 31 14:55:59.639547 2017] [ssl:error] [pid 21071] SSL Library Error: error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error (Type=PKCS8_PRIV_KEY_INFO)
[Fri Mar 31 14:55:59.639553 2017] [ssl:emerg] [pid 21071] AH02311: Fatal error initialising mod_ssl, exiting. See /var/log/apache2/error.log for more information
[Fri Mar 31 14:55:59.639558 2017] [ssl:emerg] [pid 21071] AH02564: Failed to configure encrypted (?) private key localhost:443:0, check /etc/apache2/ssl/apache.crt
AH00016: Configuration Failed

but whats wrong ? the file in /etc/apache2/ssl/apache.crt exists of course ... and why "Private key not found" ? apache.key exists too.

any help ? :(

Solution

While generating CRS request, it generates 2 files

• example.csr
• example.key -> You need to include this file in SSL configuration.

Make sure you have included key file in ssl configuration.

Key file should look like :
-----BEGIN PRIVATE KEY-----
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-----END PRIVATE KEY-----