The temp table has already been created with the same name
Rename or delete existing table or select a different temp table name in OLR GUI.
Prior to LiteSpeed for SQL version 4.8, if the destination table already existed, the error above will display. If you wanted to have a UNION of SELECT results then it caused you to CREATE and DROP a temporary table and then moving the rows to the more persistent table.
As of LiteSpeed for SQL version 4.8, if the destination table already exists and is equivalent in structure to the query results, then the rows are inserted into the existing table. For equivalence, the column names of the table and of the query results are not required to be equal. Just the number of columns and the details of the data types of each column are required to be the same. If they are not equivalent, then you get an error.