Unhandled exception: AttributeError: 'Site' object has no attribute 'greenlet_manager'

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* Opened port: yes/no
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### Step 2: Describe the problem:

#### Steps to reproduce:

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2. _____
3. _____

#### Observed Results:

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#### Expected Results:

* What did you expect to happen?

The issue contains only an AttributeError title and an empty reproduction template, with no environment or traceback details. First collect the missing environment, reproduction steps, observed results, and traceback, then locate where Site accesses greenlet_manager. Done means reproducing the exception and confirming the affected behavior works without it.

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