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Azure DevOps Server - [System.String[]] doesn't contain a method named 'Trim'

When trying to release an application using Azure DevOps Pipelines, one of the tasks failed with the following error message:

2018-12-18T14:02:03.6775235Z Deployment status for machine DEVELOPMENT : Failed

2018-12-18T14:02:03.6941240Z Deployment failed on machine DEVELOPMENT with following message : System.Exception: Method invocation failed because [System.String[]] doesn't contain a method named 'Trim'.

2018-12-18T14:02:03.7087715Z ##[error]] doesn't contain a method named 'Trim'."}};]

2018-12-18T14:02:03.9362960Z ##[error]Deployment on one or more machines failed. System.Exception: Method invocation failed because [System.String[]] doesn't contain a method named 'Trim'.

This specific task tries to do a deployment of the application using a remote execution of powershell on the target machine. The problem is that an outdated Powershell version was still running on this machine.

I checked the Powershell version using the following script:

PS C:\Users\ordina1> $PSVersionTable.PSVersion

Major  Minor  Build  Revision

-----  -----  -----  --------

2      0      -1     -1

Whoops! Still  Powershell version 2. Time for an update…

Here are the instructions to install the latest version: https://docs.microsoft.com/en-us/powershell/wmf/5.1/install-configure

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