# concurrent.futures.InvalidStateError

- **ID:** `python/concurrent-futures-invalidstateerror`
- **Domain:** python
- **Category:** runtime_error
- **Verification:** official
- **Fix Rate:** 80%

## Root Cause

Operation on a Future in an invalid state.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |