Acorn throws "Unable to detect application namespace"

[Puntpixel]

• I've read the guidelines for Contributing to Roots Projects
• This request isn't a duplicate of an existing issue
• I've read the docs and followed them (if applicable)
• This is not a personal support request that should be posted on the Roots Discourse community

Description

After developing Sage 10 project locally I deployed it on a server. Unfortunately this is shared hosting (for reasons beyond my control), so I know many restrictions apply.

The theme errors with an exception in vendor/roots/acorn/src/Acorn/Concerns/Application.php on line 749. Full error message is: Uncaught RuntimeException: Unable to detect application namespace

My access to logs is sadly restricted, so I can't say for sure what's causing this, but it happens sometimes with Laravel applications. Modifying vendor/roots/acorn/src/Acorn/Concerns/Application.php seems to resolve the issue by assigning a value to the $appPath variable on line 47 as per this thread on StackOverflow:

protected $appPath = __DIR__;

Steps to reproduce

1. Deploy theme on server
2. Activate theme
3. WordPress sends a fatal error email

Expected behavior:
The theme should load successfully.

Actual behavior:
It throws a fatal error.

Reproduces how often: Not sure.

Versions

Latest version of Acorn, v1.0.6.
PHP 7.3.15 (fastcgi) on a shared Apache server.

[Puntpixel]

After reading through the code I realised I neglected to upload my composer.json... All seems to be well now.

[RiaanWest]

@Puntpixel Thank you for leaving your solution on the Issue - it just saved my behind