---
title: ClassicalFunctionParseError (v1.0)
description: API reference for qiskit.circuit.classicalfunction.ClassicalFunctionParseError in qiskit v1.0
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit/1.0/qiskit.circuit.classicalfunction.ClassicalFunctionParseError
---

# qiskit.circuit.classicalfunction.ClassicalFunctionParseError

*exception* `qiskit.circuit.classicalfunction.ClassicalFunctionParseError(*message)`

[GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.0/qiskit/circuit/classicalfunction/exceptions.py#L24-L28)

ClassicalFunction compiler parse error. The classicalfunction function fails at parsing time.

Set the error message.