After updating to 2.6.2973, saving any entry fails, resulting in an Internal Server Error: "Could not resolve the subpath '{slug}'".

I've read the similar errors on here which trace back to Matrix Asset objects and dynamically-named folders, though I'm not using any dynamically-named folders, and I can't tell where it's pulling {slug} from, and/or what's causes the issue. I've gone through and double-checked and resaved both asset directory and field configurations.

The log again points in the direction of the Matrix Asset, and refers to the folder id "1" -- a Local Source which has both the System Path and URL completely hardcoded. The top of the trace looks like so:

#0 /[directory-path]/craft/app/fieldtypes/AssetsFieldType.php(707): Craft\AssetsFieldType->_resolveSourcePathToFolderId('1', '{slug}', true)
#1 /[directory-path]/craft/app/fieldtypes/AssetsFieldType.php(327): Craft\AssetsFieldType->_determineUploadFolderId(Object(Craft\Model))
#2 /[directory-path]/craft/app/services/ElementsService.php(1618): Craft\AssetsFieldType->onAfterElementSave()
#3 /[directory-path]/craft/app/services/MatrixService.php(778): Craft\ElementsService->saveElement(Object(Craft\MatrixBlockModel), false)
#4 /[directory-path]/craft/app/services/MatrixService.php(882): Craft\MatrixService->saveBlock(Object(Craft\MatrixBlockModel), false)
#5 /[directory-path]/craft/app/fieldtypes/MatrixFieldType.php(533): Craft\MatrixService->saveField(Object(Craft\MatrixFieldType))

This error stalls all the client's content entry, so I hoping for any additional insights or tips. Thanks so much.

  • The stack trace indicates you've got an Assets field inside of a Matrix field with an upload folder location set to {slug}. Are you sure you're looking at the correct Matrix field/Asset field combination?
    – Brad Bell
    Commented Apr 18, 2017 at 21:00
  • That was it, Brad -- I hadn't realized I set a {slug} subfolder within the Matrix/Asset field, which needed to be {owner.slug}. Thank you!
    – Marcus
    Commented Apr 18, 2017 at 21:43
  • Glad to help! Will go ahead and add it as an official answer.
    – Brad Bell
    Commented Apr 18, 2017 at 21:44

2 Answers 2


If you're setting an dynamic upload folder location for an Assets field inside of a Matrix field, you need to preface things like {slug} with {owner.slug}.

See the note about dynamic subfolders on an Assets field inside of Matrix here: https://craftcms.com/docs/assets-fields#dynamic-subfolder-paths

  • Glad this question was on here. Just had the same issue, where dynamic subfolders were working for standard fields, but not Matrix. Commented Oct 10, 2017 at 12:13

I found issue using {slug} in Global when sharing same asset field. Ended up leaving {slug} in entries field and using {id} for Global asset field (created new field), not sure if there is a better way to use Asset in global

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