Script which used to work stopped working (invoke-sqlcmd from a text file)

Hi, I am trying to script some tables and than run the script on one of the instances:

$timestamp = Get-Date -Format yyyy-MM

$TableName = 'My_Table'

# Doing table scripting here

# Output of the script goes into the text file:

$TableScriptFile | out-file "A:\$TableName Staging $timestamp.sql"

This command fails:

Invoke-Sqlcmd -InputFile "A:\$TableName Staging $timestamp.sql"

with the below error message. I can confirm the file exists. It used to work before. Any ideas?

Thanks.

Invoke-Sqlcmd : Could not find a part of the path 'A:\My_Table Staging 2015-06.sql'. At line:1 char:14 + Invoke-Sqlcmd <<<< -InputFile "A:\$TableName Staging $timestamp.sql" + CategoryInfo : InvalidResult: (:) [Invoke-Sqlcmd], DirectoryNotFoundException + FullyQualifiedErrorId : ExecutionFailed,Microsoft.SqlServer.Management.PowerShell.GetScriptCommand

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