---
title: ClassicalFunctionCompilerTypeError (v1.4)
description: API reference for qiskit.circuit.classicalfunction.ClassicalFunctionCompilerTypeError in qiskit v1.4
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit/1.4/qiskit.circuit.classicalfunction.ClassicalFunctionCompilerTypeError
---

# qiskit.circuit.classicalfunction.ClassicalFunctionCompilerTypeError

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

[GitHub](https://github.com/Qiskit/qiskit/tree/stable/1.4/qiskit/circuit/classicalfunction/exceptions.py#L37-L41)

Bases: `ClassicalFunctionCompilerError`

ClassicalFunction compiler type error. The classicalfunction function fails at type checking time.

Set the error message.