#Requires -Modules causes error "Import-Module: Assembly with same name is already loaded"

[JeremyTBradshaw]

Steps to reproduce

Call a script or function with #Requires -Modules [module info], while having the the required module installed. I've only tested with the PartnerCenter module, using either of these in my tests:

#Requires -Modules @{ModuleName='PartnerCenter';ModuleVersion='3.0.10'}, Az.Accounts

or

#Requires -Modules PartnerCenter

Both produce the same error when calling the script.

PS C:\Users\MY-USER> .\Documents\GitHub\PowerShell\Connect-PartnerCenterAsSecureApp.ps1
Import-Module: Assembly with same name is already loaded

The script I'm calling is very basic (https://github.com/JeremyTBradshaw/PowerShell/blob/master/Connect-PartnerCenterAsSecureApp.ps1)

Expected behavior

I expect the script to not fail immediately and instead carry on because I have the module that is required already installed, and it shouldn't matter if it is already loaded or not. For this example script, I should get prompted for the values of the mandatory properties whereas my example has omitted using any parameters.

PS C:\Users\MY-USER>.\Documents\GitHub\PowerShell\Connect-PartnerCenterAsSecureApp.ps1

cmdlet Connect-PartnerCenterAsSecureApp.ps1 at command pipeline position 1
Supply values for the following parameters:
CSPTenantId:

Actual behavior

PS C:\Users\MY-USER> .\Documents\GitHub\PowerShell\Connect-PartnerCenterAsSecureApp.ps1
Import-Module: Assembly with same name is already loaded

Environment data

Name                           Value
----                           -----
PSVersion                      7.0.3
PSEdition                      Core
GitCommitId                    7.0.3
OS                             Microsoft Windows 10.0.19041
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

[vexx32]

This sounds like it might be an issue with the module.

Are you able to import that module outside of this context?

[iSazonov]

I see PartnerCenter depends on NewtonSoft.Json - perhaps Az module too but another version.
https://github.com/microsoft/Partner-Center-PowerShell/tree/master/src/lib/NetFxPreloadAssemblies

GitHub

microsoft/Partner-Center-PowerShell

PowerShell module for managing Partner Center resources. - microsoft/Partner-Center-PowerShell

[JeremyTBradshaw]

@vexx32 I can import the module, as well as install and update, successfully. One thing that may be part of the issue is that I always install modules into CurrentUser scope as I'm working from a few computers without admin rights so I started that habit a while back for that reason. Below I'm trying to demonstrate how I can import the module and it successfully imports the latest version:

PowerShell 7.0.3
Copyright (c) Microsoft Corporation. All rights reserved.

https://aka.ms/powershell
Type 'help' to get help.

PS C:\Users\MyUser> Get-Module PartnerCenter
PS C:\Users\MyUser> Import-Module PartnerCenter
PS C:\Users\MyUser> Get-Module PartnerCenter

ModuleType Version    PreRelease Name                                ExportedCommands
---------- -------    ---------- ----                                ----------------
Script     3.0.10                PartnerCenter                       {Add-PartnerCustomerCartLineItem, Add-PartnerCustomerUserRoleMember,…

PS C:\Users\MyUser> Get-Module PartnerCenter -ListAvailable


    Directory: C:\Users\MyUser\Documents\PowerShell\Modules

ModuleType Version    PreRelease Name                                PSEdition ExportedCommands
---------- -------    ---------- ----                                --------- ----------------
Script     3.0.10                PartnerCenter                       Core,Desk {Add-PartnerCustomerCartLineItem, Add-PartnerCustomerUserR…
Script     3.0.9                 PartnerCenter                       Core,Desk {Add-PartnerCustomerCartLineItem, Add-PartnerCustomerUserR…

PS C:\Users\MyUser>

[iSazonov]

Can you load both modules in the same session?

[JeremyTBradshaw]

Well I had to be that guy, but it seems I was having trouble commenting out the line:

#Requires -Modules @{ModuleName='PartnerCenter';ModuleVersion='3.0.10'}, Az.Accounts

In the end, the problem is with the Az.Accounts module, and I get the same error when I manually try to import it.

PS C:\Users\MyUser> Get-module az.accounts
PS C:\Users\MyUser> Get-module az.accounts -ListAvailable


    Directory: C:\Program Files\WindowsPowerShell\Modules

ModuleType Version    PreRelease Name                                PSEdition ExportedCommands
---------- -------    ---------- ----                                --------- ----------------
Script     1.5.2                 Az.Accounts                         Core,Desk {Disable-AzDataCollection, Disable-AzContextAutosave, Enab…

PS C:\Users\MyUser> Import-Module az.Accounts
Import-Module: Assembly with same name is already loaded
PS C:\Users\MyUser>

I will continue to troubleshoot it now and report back anything I can find.

[vexx32]

@iSazonov mentioned that both the Az.Accounts module and PartnerCenter depend on Newtonsoft.Json but seem to require different versions; the best bet would be to try to find a common version that can work for both and update one of the module manifests, I think.

[JeremyTBradshaw]

@vexx32 and @iSazonov thanks again for you help. I just uninstalled the older 1.5.2 version of Az.Accounts (from the AllUsers scope) and installed the latest into CurrentUser. This immediately solved my problem.

I wish I had caught this before opening the issue, so apologies for the wasted cycles.