# Upgrading to Acorn 3 got Roots\Acorn\Assets\Manager::manifest(): Argument #1 ($name) must be of type string, null given

**URL:** https://discourse.roots.io/t/upgrading-to-acorn-3-got-roots-acorn-assets-manager-manifest-argument-1-name-must-be-of-type-string-null-given/24672
**Category:** acorn
**Tags:** sage10
**Created:** 2023-01-27T23:36:44Z
**Posts:** 4
**Showing post:** 2 of 4

## Post 2 by @ben — 2023-01-27T23:42:28Z

See **[How to best ask questions on this forum](https://discourse.roots.io/t/how-to-best-ask-questions-on-this-forum/24582)**

How do we reproduce this issue?

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_[View the full topic](https://discourse.roots.io/t/upgrading-to-acorn-3-got-roots-acorn-assets-manager-manifest-argument-1-name-must-be-of-type-string-null-given/24672)._