Powershell UNC Path exception not supported

Well, I've been struggling with this for so long. I have a project to compare two folders, one on each of the two servers. We compare the files on the source server with the destination servers on the target server and create a list of files from the source that need to be updated after the update is completed on the target server.

Here is my script (thank you very much http://quickanddirtyscripting.wordpress.com for the original):

param ([string] $src,[string] $dst)

function get-DirHash()
{
    begin 
    {
        $ErrorActionPreference = "silentlycontinue"
    }
    process 
    {
        dir -Recurse $_ | where { $_.PsIsContainer -eq $false -and ($_.Name -like "*.js" -or $_.Name -like "*.css"} | select Name,FullName,@{Name="SHA1 Hash"; Expression={get-hash $_.FullName -algorithm "sha1" }}
    }
    end 
    {
    }
}  

function get-hash 
{
    param([string] $file = $(throw 'a filename is required'),[string] $algorithm = 'sha256')
    try
    {
        $fileStream = [system.io.file]::openread((resolve-path $file));
        $hasher = [System.Security.Cryptography.HashAlgorithm]::create($algorithm);
        $hash = $hasher.ComputeHash($fileStream);
        $fileStream.Close();
    }
    catch
    {
        write-host $_
    }
    return $hash
}

Compare-Object $($src | get-DirHash) $($dst | get-DirHash) -property @("Name", "SHA1 Hash")

Now for some reason, if I run it with respect to local paths, let's say it c:\temp\test1 c:\temp\test2works fine, but when I run it using paths UNCbetween two servers, I get

An OpenRead exception is thrown with argument "1": "This path format is not supported."

. , - UNC.

script compare_js_css.ps1 :

.\compare_js_css.ps1 c:\temp\test1 c:\temp\test2 < -

.\compare_js_css.ps1 \\\\devserver1\c$\websites\site1\website \\\\devserver2\c$\websites\site1\website < - .

?