NOWAIT error when appending with SQL LOADER

I've this process that would perform multiple sql load into the same table with append option. It was working fine and then I get this error in 1 of my load.

Number to load: ALL
Number to skip: 0
Errors allowed: 50
Continuation:    none specified
Path used:      Direct

Table OWNER.SCORES_TEMP, loaded from every logical record.
Insert option in effect for this table: APPEND
TRAILING NULLCOLS option in effect

   Column Name                  Position   Len  Term Encl Datatype
------------------------------ ---------- ----- ---- ---- ---------------------
ID                           FIRST     *   |  O(") CHARACTER            
HSE                              NEXT     *   |  O(") CHARACTER            
PROB                                 NEXT     *   |  O(") CHARACTER            
MODEL                           NEXT     *   |  O(") CHARACTER            
SCORE_DATE                           NEXT     *   |  O(") DATE YYYY-MM-DD      

SQL*Loader-951: Error calling once/load initialization
ORA-00604: error occurred at recursive SQL level 1
ORA-00054: resource busy and acquire with NOWAIT specified

I;ve read that update could cause this error, but haven't found anything on sql loading. What to do?
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most probably there is another session doing some DML activities on the table. Make sure that no other user is connected and try again
ku916Author Commented:
There aren't any users using the systems. this is in staging where the whole thing is lock-down.
try loading witout the direct=y clause

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check in v$locked_objects whether any objects are locked and what are the sid which are locking them. Kill then sessions and their OS processes or do a restart of the DB. It might also be that a previous session of SQL*loader is locking the object.
Is there any trigger on the affected table? If it's, then check it's status.

Hi there !

Start ur SQL*Loader process, run the following query (in SQL*PLUS) immediately:

select (select username from v$session where sid=a.sid) blocker,
a.sid, 'is  blocking',(select username from v$session where sid=b.sid) Blockee, b.sid
from V$lock a , v$lock b
where a.block=1
and b.request > 1
and a.id1=b.id1
and a.id2 = b.id2

It will tell you who is blocking who.

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