Error "The type initializer for 'CXS.Retail.API.IntegrationService' threw an exception"

Error "The type initializer for 'CXS.Retail.API.IntegrationService' threw an exception"

Environment: 

iVend Version 6.6 8024 with SAPB1.

Product Statement - 

Getting an error while log on to hospitality web "The type initializer for 'CXS.Retail.API.IntegrationService' threw an exception".

Resolution/Work Around: 

We find iVend API was not updated in configuration manager.

Recommendations /Suggestion: 

Configure the iVend Hospitality web according to the Documentation.

Note- CS0010711