Error building Nuget packages when using variable in the nuspec file

Hi,

Im trying to build a nuget packages in TC.

We get the following error when builing the Nuget package:

In the nuspec we are using the following configuration (snip):

<?xml version="1.0"?>
<package xmlns="http://schemas.microsoft.com/packaging/2013/05/nuspec.xsd">
<metadata>
<!-- Title, author, description is taken from AssemblyInfo.cs. ID is the name of the packaged -->
<id>$id$</id>

<!-- The package version number that is used when resolving dependencies. Note that the version number is kept in the nuspec file, *not* in AssemblyInfo.cs, in order to
avoid 4-part version numbers and stick to SemanticVersion 2.0.0. See http://semver.org/ -->
<version>1.0.1</version>

<authors>$title$</authors>

<owners>$author$</owners>

This configuration (fx. %title%) works when we build the Nuget packaged outside TeamCity and is well documented by Microsoft.

https://docs.microsoft.com/en-us/nuget/reference/nuspec

Can you help?