Import-PWDocuments usage. "Valid default storage area OR ProjectWise folder path must be provided"

If the ProjectWiseFolder path specified exists then the Import-PWDocuments cmdlet will inherit that folders storage area as it creates any subfolders below that, however if it does not exist it is necessary to define the -DefaultStorage parameter as input to the cmdlet so ProjectWise knows which storage area to apply to the folders created. So in your example above either create the ProjectWise folder "Test-Project\Samples" before running your script or supply the -DefaultStorage parameter. You can check the available storage areas with Get-PWStorageAreaList 

Hi Olivier Doucet

Did you found the solution for this, even I am getting the same error.. Since I am new to PW and powershell, unable to resolve it.

I am sorry but I cannot find the exact context and code for it. The code I used this for is now defunct.
Did you try what Robert McMillan suggested?

At some point I wrote the following function as I was experiencing some trouble with Create/Update docs in PW.
Maybe it helps:

#Requires -Modules pwps_dab

function CreateOrUpdate-PWDoc {
  [cmdletbinding()]
  param (
    [Parameter(
      Mandatory = $true,
      ValueFromPipeline = $true)]
    [string]$InputFilePath
    ,
    [Parameter(Mandatory = $true)]
    [Alias('TargetDirPath')]
    [string]$TargetFolderPath
  )

  Process {

    $targetDocName = Split-Path -Path $InputFilePath -Leaf
    Write-Host "Searching for document $TargetFolderPath\$targetDocName."
    $docSearch = @{
      FolderPath     = $TargetFolderPath
      JustThisFolder = $true
      FileName       = $targetDocName
      GetVersionsToo = $false
      Verbose        = $false
      WarningAction  = "Continue"  # Remove quotes around "Continue" and you'll jump to next iteration /!\
    }

    $docs = Get-PWDocumentsBySearchWithReturnColumns @docSearch
    $matchCount = $docs.Count

    if (0 -eq $matchCount) {
      # Create new
      New-PWDocument -FilePath $InputFilePath -FolderPath $TargetFolderPath -WarningAction Stop
      Write-Host "Created new document $TargetFolderPath\$targetDocName."
      return
    }

    if (1 -eq $matchCount) {
      # Update/overwrite existing
      $docs[0] | Update-PWDocumentFile -NewFilePathName $InputFilePath -WarningAction Stop
      Write-Host "Updated document $TargetFolderPath\$targetDocName."
      return
    }

    Write-Error "The search for $targetDocName yielded $matchCount matches..."
  }

}