fix malformed json

Removing (,) to avoid parsing errors:    

{"error":"MapperParsingException[failed to parse]; nested: JsonParseException[Unexpected character ('}' (code 125)): was expecting either valid name character (for unquoted name) or double-quote (for quoted) to start field name\n at [Source: [B@35e698; line: 1, column: 167]]; ","status":400}%