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title BCP338
description Failed to evaluate parameter <parameter-name>.
ms.topic reference
ms.date 10/30/2025
ms.custom devx-track-bicep

Bicep diagnostic code - BCP338

This diagnostic occurs when Bicep can't resolve a parameter name in a Bicep parameters file.

Description

Failed to evaluate parameter <parameter-name>: <diagnostic-message>.

Level

Error

Solution

Check the value of the parameter.

Examples

The following Bicep parameters file produces the error because the 'testEnvironmentVariable' environment variable can't be found:

using 'main.bicep'
param parTest = readEnvironmentVariable('testEnvironmentVariable')

It could be because the environment variable isn't defined at the user or system level. For more information, see the readEnvironmentVariable() function.

Next steps

To learn more about Bicep diagnostics, see Bicep core diagnostics.