MSB4086: A numeric comparison was attempted on 'expression' that evaluates to 'value' instead of a number, in condition 'condition'

This error occurs in an MSBuild project file when a number was expected in a condition expression, but the expression evaluated to a non-numeric value. If this error occurs in your project file, check the project file for syntax errors and other problems. For help with the syntax, see MSBuild conditions at MSBuild conditions.

Check the MSBuild properties to see that you're using them as expected. Check that the properties used in the condition expression, especially those properties that are expected to have a numeric value, are set to a numeric value with the correct syntax.

This error can also be generated if there is a problem with setting the numeric value. The root cause could be another error, such as an installation issue. For example, if a version number of an installed tool was used in a condition expression, but the tool was not installed.