SSL- crt and key

we have the JKS that works while invoking webservice from SOAPUI. We are migrating to POSTMAN from SOAPUI. I imported

the crt, key, pem from that JKS and tried using combination of all and still not working. Any idea what might be wrong or any specific way i can create crt and key for POSTMAN ?

see attachment for the screen shot


there was an error running your collection: write EPROTO 101057795:error:14094412:SSL routines:ssl3_read_bytes:sslv3 alert bad certificate:c:\projects\electron\vendor\node\deps\openssl\openssl\ssl\s3_pkt.c:1487:SSL alert number 42 101057795:error:1409E0E5:SSL routines:ssl3_write_bytes:ssl handshake failure:c:\projects\electron\vendor\node\deps\openssl\openssl\ssl\s3_pkt.c:656: