0967bf21_Lotus_Notes_Traveler_8_5_2__Steps_to_Resolve_Error
[Error Number] 21 [Error Message] Invalid parameter [Notes] The sync client was unable to obtain required information from the configuration utility. [Steps to Resolve Error] 
Revalidate the user name, password, server name, and http protocol. Ensure that Traveler has the correct information stored.
Lotus Notes Traveler 8.5.2
Steps to Resolve Error