Azure – Azure AD – resolving error – Microsoft.IdentityModel.Clients.ActiveDirectory.AdalServiceException: AADSTS7000218: The request body must contain the following parameter: ‘client_assertion’ or ‘client_secret’

Today new issue and solution. We resolved following exception :
Microsoft.IdentityModel.Clients.ActiveDirectory.AdalServiceException: AADSTS7000218: The request body must contain the following parameter: ‘client_assertion’ or ‘client_secret’