Unable to DPB on Mellanox SN2700

[Chintan Mistry]

Hi,

I am facing an issue with the DPB on Mellanox SN2700, I tried to accommodate all the changes in the respective YANG models, sonic-feature.yang, sonic-flex_counter.yang, but then there's this error:

root@localhost:~# config interface breakout Ethernet0 4x10G[25G]
Do you want to Breakout the port, continue? [y/N]: y

Running Breakout Mode : 1x100G[50G,40G,25G,10G]
Target Breakout Mode : 4x10G[25G]

Ports to be deleted :
{
"Ethernet0": "100000"
}
Ports to be added :
{
"Ethernet0": "10000",
"Ethernet1": "10000",
"Ethernet2": "10000",
"Ethernet3": "10000"
}

After running Logic to limit the impact

Final list of ports to be deleted :
{
"Ethernet0": "100000"
}
Final list of ports to be added :
{
"Ethernet0": "10000",
"Ethernet1": "10000",
"Ethernet2": "10000",
"Ethernet3": "10000"
}
Note: Below table(s) have no YANG models:
KDUMP, SNMP, SNMP_COMMUNITY, XCVRD_LOG,
Below Config can not be verified, It may cause harm to the system
{}
Do you wish to Continue? [y/N]: y
Create Config to load in DB, Failed
'str' object has no attribute 'append'
Config Diff Generation failed
'str' object has no attribute 'append'
'str' object has no attribute 'append'
Port Deletion Failed
[ERROR] Port breakout Failed!!! Opting Out
Failed to break out Port. Error:

Can someone help me identity there is this str object?