R3load exited with return code 6

[barbashyn-oa]

Hello,
I'm exporting Oracle database with SAP R3load tool.

During export I have the following error:
Unloading of 'SAPAPPL0_32' export package is interrupted with R3load error.
Process '/sapmnt/PIP/exe/R3load -e SAPAPPL0_32.cmd -datacodepage 4103 -l SAPAPPL0_32.log -stop_on_error' exited with return code 6.
For mode details see 'SAPAPPL0_32.log' file.

The content of SAPAPPL0_32.log file is:
/sapmnt/PIP/exe/R3load: START OF LOG: 20250418150458
/sapmnt/PIP/exe/R3load: sccsid @(#) $Id: //bas/722_STACK/src/R3ld/R3load/R3ldmain.c#2 $ SAP
/sapmnt/PIP/exe/R3load: version R7.20/V1.6 [UNICODE]
Compiled Feb 25 2022 14:40:39
/sapmnt/PIP/exe/R3load -ctf E /backup/install/PIP_EXP/ABAP/DATA/SAPAPPL0_32.STR /backup/install/PIP_EXP/ABAP/DB/DDLORA_LRG.TPL SAPAPPL0_32.TSK ORA -l SAPAPPL0_32.log
(PRC) INFO: working directory "/tmp/sapinst_instdir/BS2010/ERP605/LM/COPY/ORA/EXP/DISTRIBUTED/AS/EXPDB"
(RTF) ########## WARNING ###########
Without ORDER BY PRIMARY KEY the exported data may be unusable for some databases
/sapmnt/PIP/exe/R3load: job completed

Does anybody know what R3load "return code 6" mean?
Could not find R3load return codes list.
Thank you.