Invalid driver warning - Deleting a modifier or constraint with a driver still active produces persistent warning #89811

New Issue

Marcus Krupa · 2021-07-12T12:01:08+02:00

Marcus Krupa commented

2021-07-12 12:01:08 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.89

Blender Version
Broken: version: 2.93.2 Release Candidate, branch: master, commit date: 2021-07-07 05:52, hash: 9e64fd461a
Present in all version I've tried, from 2.93.0 to current (21-07-12) 3.0 Alpha

Short description of error
Deleting a modifier or constraint with a driver still active produces persistent warning:

anim_sys.c:3132 BKE_animsys_eval_driver: invalid driver

To get rid of said warning, which persists between sessions, you have to recreate a modifier/constraint of the same type, (which will then still have the driver present), delete driver, then delete the modifier/constraint. (Or delete object)

Really pernicious warning, since it references a modifier/constraint that the user has deleted and can't find anymore.

Exact steps for others to reproduce the error

Create modifier/constraint
Create a driver which drives a value in modifier/constraint
Delete said modifier/constraint by clicking the X icon on said modifier/constraint
eval_driver_bug_a01.mp4

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.89 **Blender Version** Broken: version: 2.93.2 Release Candidate, branch: master, commit date: 2021-07-07 05:52, hash: `9e64fd461a` Present in all version I've tried, from 2.93.0 to current (21-07-12) 3.0 Alpha **Short description of error** Deleting a modifier or constraint with a driver still active produces persistent warning: anim_sys.c:3132 BKE_animsys_eval_driver: invalid driver To get rid of said warning, which persists between sessions, you have to recreate a modifier/constraint of the same type, (which will then still have the driver present), delete driver, *then* delete the modifier/constraint. (Or delete object) Really pernicious warning, since it references a modifier/constraint that the user has deleted and can't find anymore. **Exact steps for others to reproduce the error** - Create modifier/constraint - Create a driver which drives a value in modifier/constraint - Delete said modifier/constraint by clicking the X icon on said modifier/constraint [eval_driver_bug_a01.mp4](https://archive.blender.org/developer/F10221464/eval_driver_bug_a01.mp4)

Marcus Krupa commented

2021-07-12 12:01:08 +02:00

Added subscriber: @marcus-13

Philipp Oeser commented

2021-07-12 12:13:48 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-07-12 12:13:48 +02:00

This is essentially the same as #89679 (Animation channels do not get removed from action when according modifier/constraint is deleted), please read #89679 for design considerations.
In short: this is not considered a bug, will merge these reports.

This is essentially the same as #89679 (Animation channels do not get removed from action when according modifier/constraint is deleted), please read #89679 for design considerations. In short: this is not considered a bug, will merge these reports.

Philipp Oeser commented

2021-07-12 12:13:57 +02:00

Closed as duplicate of #89679

Philipp Oeser closed this issue

2021-07-12 12:13:57 +02:00

Rombout Versluijs commented

2021-11-11 20:59:19 +01:00

Added subscriber: @RomboutVersluijs

Rombout Versluijs commented

2021-11-11 20:59:19 +01:00

Ive noticed this same behavior when i opened a file created in bl2.93.5 from windows on my osx machine using 2.83. I know it warns me for compatibility and such, but seeing this issue has been stated couple times here in devtalk. I thought i would add this comment.

What i noticed is that when i preview the bend modifier in the 3dview all looks fine. But when i do a render or animation render, then i see this warning.

Same as @marcus-13 stated, only way to salve this is to delete all drivers and rebuild everything. Not really ideal! But i guess this would be seen as a backward compatibility issue perhaps. Im not sure if it the modifier being different though. The error is about the driver, but that driver menu looks exactly the same as on 2.93.5

Ive noticed this same behavior when i opened a file created in bl2.93.5 from windows on my osx machine using 2.83. I know it warns me for compatibility and such, but seeing this issue has been stated couple times here in devtalk. I thought i would add this comment. What i noticed is that when i preview the bend modifier in the 3dview all looks fine. But when i do a render or animation render, then i see this warning. Same as @marcus-13 stated, only way to salve this is to delete all drivers and rebuild everything. Not really ideal! But i guess this would be seen as a backward compatibility issue perhaps. Im not sure if it the modifier being different though. The error is about the driver, but that driver menu looks exactly the same as on 2.93.5 ![bned modifier issue bl293 > bl283.png](https://archive.blender.org/developer/F11794457/bned_modifier_issue_bl293___bl283.png)

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Invalid driver warning - Deleting a modifier or constraint with a driver still active produces persistent warning #89811