Key Exchange Failed

Hello, I am trying to connect via sftp over ssh to test this program to see if I can use it for a small business. I am entering all the correct data for an sftp connection, but am receiving the following error:
[09:20:52] SmartFTP 6.0.2123.0
[09:20:52] 5>Resolving host name "12.199.176.138"
[09:20:52] 5>Connecting to 12.199.176.138 Port: 22
[09:20:52] 5>Connected to 12.199.176.138.
[09:20:52] 5>SSH protocol version reply. Client Id: SSH-2.0-SmartFTP
[09:20:52] 5>SSH-2.0-VShell_3_0_0_439 VShell
[09:20:52] 5>Starting SSH session. Remote Id: "SSH-2.0-VShell_3_0_0_439 VShell"
[09:20:52] 5>Server Algorithm Suite
             Key Exchange: diffie-hellman-group1-sha1,diffie-hellman-group-exchange-sha1
             Server Host Key: ssh-dss
             Client to Server Encryption: aes256-cbc,aes192-cbc,aes128-cbc,twofish-cbc,blowfish-cbc,3des-cbc,arcfour
             Server to Client Encryption: aes256-cbc,aes192-cbc,aes128-cbc,twofish-cbc,blowfish-cbc,3des-cbc,arcfour
             Client to Server HMAC: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96
             Server to Client HMAC: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96
             Client to Server Compression: zlib@openssh.com,zlib,none
             Server to Client Compression: zlib@openssh.com,zlib,none
[09:20:52] 5>Key exchange failed.
[09:20:52] 5>Client closed the connection.
 
any help on rectifying this issue would be wonderful, as if I can make this work, I will be purchasing a license to use this software long-term.

Manually enable the insecure AES CBC ciphers in the SSH dialog in the favorite properties.