SQL Navigator does not include the SYS schema prefix to the background query of USER_ERRORS view. This view also happens to exist in current schema and it does not include the TYPE column. Therefore, SQL Nav is using USER_ERRROS view in the current schema instead of SYS schema.
解决办法
WORKAROUND: Rename USER_ERRORS in current schema.
STATUS: Waiting for fix to be released in a future version of SQL Navigator for Oracle.
