EasyMorph Server SSL certificate format

Was trying to install an SSL certificate to EasyMorph's server, however, it returns the following error:

The file I tried to upload was a .crt file provided by an SSL provider, but it seems that's not the right format. What is the correct file format for this?

The error message says that the uploaded file has no private key.
EasyMorph expects the file to contain private and public keys in a single .pfx file (pkcs12 format).

You should compose .pfx file from .crt file and your private key file .key.
For example, here is an OpenSSL command to compose files into a single one.

openssl pkcs12 -export -out result_file.pfx -inkey private.key -in cert.crt

If you have additional certificates:

openssl pkcs12 -export -out result_file.pfx -inkey private.key -in cert.crt -certfile chain.crt

The result file result_file.pfx can be installed via Monitor.