Server Error in '/iVendReplication' Application.Input string was not in a correct format on

Server Error in '/iVendReplication' Application.Input string was not in a correct format on

Problem Statement

Replication is not working on Store

Error :

Server Error in '/iVendReplication' Application.Input string was not in a correct format.

Version 

ivend 6.6

Recommendation:

Please check the web config file on Store and check 
Below tag value should be available

    <add key="SiteId" value="2"/>
    <add key="ServerSiteId" value="1"/>
    <add key="ServerAddress" value="http://...../iVendReplication/iVend/Hubs"/>