Error downloading xliff translationpackage

Hi,

I'm getting a 500-error when trying to download a "translation package" created with the Languages Addon. Am I missing any config, or is it a problem with some of the content?

Thanks!

/Frode

2017-05-09 09:27:59,261 [30] ERROR EPiServer.Labs.LanguageManager.Business.XLIFFTranslationPackageExporter: Exception: System.ArgumentException: Part URI is not valid per rules defined in the Open Packaging Conventions specification.
at System.IO.Packaging.PackUriHelper.ValidatePartUri(Uri partUri)
at System.IO.Packaging.Package.CreatePart(Uri partUri, String contentType, CompressionOption compressionOption)
at EPiServer.Labs.LanguageManager.Business.XLIFFTranslationPackageExporter.ExportProjectContents(IEnumerable`1 projectContentLinks, ZipPackage package)
at EPiServer.Labs.LanguageManager.Business.XLIFFTranslationPackageExporter.TryExport(Int32 projectId, String& packagePath, String& packageName)[Part URI is not valid per rules defined in the Open Packaging Conventions specification.].
2017-05-09 09:27:59,261 [30] DEBUG EPiServer.Labs.LanguageManager.Controllers.ExportingController: Exporting Project Id = 1 fail.