ArgumentCountError: Too few arguments to function Drupal\canvas\AutoSave\AutoSaveManager::__construct() after updating to Canvas 1.9.0 [#3613873]

Problem/Motivation

In ProcessBase.php line 171:

Unable to decode output into JSON: Syntax error

ArgumentCountError: Too few arguments to function Drupal\canvas\AutoSave\AutoSaveManager::__construct(), 7 passed in /var/www/html/web/modules/contrib/canvas_builder/sr
c/AutoSave/CanvasBuilderAutoSaveManager.php on line 58 and exactly 8 expected in Drupal\canvas\AutoSave\AutoSaveManager->__construct() (line 112 of /var/www/html/web/mo
dules/contrib/canvas/src/AutoSave/AutoSaveManager.php).

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Comments

Comment #1

29 July 2026 at 15:21

thomas.frobieter created an issue. See original summary.

Comment #2

aaronchristian commented 30 July 2026 at 03:59

Assigned:

Unassigned

» aaronchristian

Comment #3

aaronchristian commented 30 July 2026 at 12:15

This one's fixed on 1.0.x as well.

The issue was that we were overriding AutoSaveManager::__construct() with Canvas's exact constructor signature. That worked until Canvas 1.9.0 added another required parameter, which immediately broke our subclass.

The fix was to remove the constructor override entirely. The extra dependencies our subclass needs are now injected through a setter in the service provider, so we're no longer tied to Canvas's constructor signature.

I verified it by patching a local copy of Canvas to require the additional constructor argument, which reproduced your exact error. With the current 1.0.x code, everything resolves cleanly and the test suite passes.

It's included in the same commit (7459dbf), so it should be good to test against Canvas 1.9.0.