I also got this warning, and the collection couldn't be built. From the previous messages about this topic. I suspect the reason for the failure on building is that some of the documents don't contain the metadata that I am trying to build a List on.

Could anyone give me a confirmation on if my suspection is correct or not? I really hope it can work even some documents don't have specified metadata, because my collection consists documents from heterogenous sources.

I appreciate any suggestions and replies!

********Below are the warning messages*********
Version: v2.40 for Unix
Platform: Red Hat Linux release 7.3 (Valhalla)
Built on commandline

WARNING: List::classify called multiple times for HASH01679c6fdfcfd06834e6e54b
No value given for -buttonname.

Incorrect options passed to List, check your collect.cfg file
usage: classify List [options]

specific options:
-metadata <metadata> (REQUIRED) Metadata field used for classification. List
will be sorted by this element.

-buttonname <string> Button name for this classification.
Default: Metadata element specified with -metadata

-sort <string> Metadata field to sort by. If not set, sorts in build
(random) order.
Default: Metadata field specified with -metadata

general options (from BasClas):
-builddir <string> Where to put the built indexes.
Default:

-outhandle <string> The file handle to write output to.
Default: STDERR

-verbosity <enum> Controls the quantity of output.
Default: 2

0: No output.
1: A little bit of output.
2: Some output.
3: Lots of output.

Uncaught exception from user code:

List::new(undef, undef, undef, undef, undef, undef, undef) called at (eval 338) line 1
eval '$listclassobj = new List(@args)
;' called at /ppa/DocRoot/gsdl/perllib/classify/AZCompactList.pm line 414
AZCompactList::reinit('AZCompactList=HASH(0x8865ddc)', 'ARRAY(0x88a95a4)') called at /ppa/DocRoot/gsdl/perllib/classify/AZCompactList.pm line 621
AZCompactList::get_classify_info('AZCompactList=HASH(0x8865ddc)') called at /ppa/DocRoot/gsdl/perllib/classify.pm line 117
classify::output_classify_info('ARRAY(0x82276ec)', 'mgbuilder::PIPEOUT', 0) called at /ppa/DocRoot/gsdl/perllib/mgbuilder.pm line 762
mgbuilder::make_infodatabase('mgbuilder=HASH(0x82423bc)') called at /ppa/DocRoot/gsdl/bin/script/buildcol.pl line 439
buildcol::main() called at /ppa/DocRoot/gsdl/bin/script/buildcol.pl line 216
Uncaught exception from user code:

List::new(undef, undef, undef, undef, undef, undef, undef) called at (eval 338) line 1
eval '$listclassobj = new List(@args)
;' called at /ppa/DocRoot/gsdl/perllib/classify/AZCompactList.pm line 414
AZCompactList::reinit('AZCompactList=HASH(0x8865ddc)', 'ARRAY(0x88a95a4)') called at /ppa/DocRoot/gsdl/perllib/classify/AZCompactList.pm line 621
AZCompactList::get_classify_info('AZCompactList=HASH(0x8865ddc)') called at /ppa/DocRoot/gsdl/perllib/classify.pm line 117
classify::output_classify_info('ARRAY(0x82276ec)', 'mgbuilder::PIPEOUT', 0) called at /ppa/DocRoot/gsdl/perllib/mgbuilder.pm line 762
mgbuilder::make_infodatabase('mgbuilder=HASH(0x82423bc)') called at /ppa/DocRoot/gsdl/bin/script/buildcol.pl line 439
buildcol::main() called at /ppa/DocRoot/gsdl/bin/script/buildcol.pl line 216
Uncaught exception from user code:

AZCompactList::reinit('AZCompactList=HASH(0x8865ddc)', 'ARRAY(0x88a95a4)') called at /ppa/DocRoot/gsdl/perllib/classify/AZCompactList.pm line 621
AZCompactList::get_classify_info('AZCompactList=HASH(0x8865ddc)') called at /ppa/DocRoot/gsdl/perllib/classify.pm line 117
classify::output_classify_info('ARRAY(0x82276ec)', 'mgbuilder::PIPEOUT', 0) called at /ppa/DocRoot/gsdl/perllib/mgbuilder.pm line 762
mgbuilder::make_infodatabase('mgbuilder=HASH(0x82423bc)') called at /ppa/DocRoot/gsdl/bin/script/buildcol.pl line 439
buildcol::main() called at /ppa/DocRoot/gsdl/bin/script/buildcol.pl line 216

****************************

Nice weekend!

Xiao