# Dash Common Issues

> Sub-skill of dash: Common Issues.

- Skill: `vamseeachanta/dash-common-issues` (Agent Skill)
- Install (CLI): `npx skillmds@latest add vamseeachanta/dash-common-issues`
- Raw SKILL.md: https://api.skillmd.com/api/skills/vamseeachanta/dash-common-issues/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: vamseeachanta (https://skillmd.com/u/vamseeachanta)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/vamseeachanta/dash-common-issues

---


# Common Issues

## Common Issues


**Issue: Callback not firing**
```python
# Check component IDs match exactly
# Verify Input/Output/State decorators
# Check for circular dependencies
```

**Issue: Slow initial load**
```python
# Use loading states
dcc.Loading(
    children=[dcc.Graph(id="graph")],
    type="circle"
)
```

**Issue: Memory leaks**
```python
# Clear caches periodically
# Use background callbacks for long operations
# Limit data in client-side stores
```

**Issue: Multiple callback outputs**
```python
# Use allow_duplicate=True for same output
@callback(
    Output("output", "children", allow_duplicate=True),
    Input("button2", "n_clicks"),
    prevent_initial_call=True
)
```