Importing a package with SMTP Connection Manager-SSIS 2017

I am trying to import a package to SSIS 2017 .I have a SMTP connection manager in my package which is causing the issue while I import :

OLE received a packet with an invalid extension. (Exception from HRESULT: 0x80010112) (Microsoft.SqlServer.DTSRuntimeWrap)

I have tried removing the connection manager and did an import.It worked.

Can you please let me know if I am missing any assemblies?