How to solve mobile app error

While I am trying to do initial data download on mobile app, it failed.

An error log is shown on error log management page.

Does anyone know how to solve this issue?

log

Message SendStatisticsOperation.main():Error while sending sync statics:

Optional(Error Domain=com.salesforce.RestAPI.ErrorDomain Code=400”(null)”

User info={error=(

{

error code = “REQUIRED_FIELD_MISSING”;

);

message = “Required fields are missing: [MetadataVersion]”;

}…..