unable to restore-spsite

Hi

I have managed to backup my site collection.

But am having issues restoring it...:

Cant seem to find any articles related to this...

PS C:\Windows\system32> Restore-SPSite -Identity $fellesomradepURL -Path $RestorePath  -HostHeaderWebApplication $hostwebapp -Confirm:$false -Force -Verbose -DatabaseServer $DBServer -DatabaseName $RestoreContentDB
VERBOSE: Leaving BeginProcessing Method of Restore-SPSite.
VERBOSE: Performing operation "Restore-SPSite" on Target "http://sitehostname.domain.com".
Restore-SPSite : Invalid URI: The format of the URI could not be determined.
At line:1 char:1+ Restore-SPSite -Identity $fellesomradepURL -Path $RestorePath  -HostHeaderWebApp ...+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+ CategoryInfo          : InvalidData: (Microsoft.Share...dletRestoreSite:SPCmdletRestoreSite) [Restore-SPSite], UriFormatException+ FullyQualifiedErrorId : Microsoft.SharePoint.PowerShell.SPCmdletRestoreSite
VERBOSE: Leaving ProcessRecord Method of Restore-SPSite.
VERBOSE: Leaving EndProcessing Method of Restore-SPSite.

Any help will be appriciated!

br

Bjorn