The  error message indicates that the item(s) with the given ids noted in the error are not in the test structure selected for the import. You must select a structure that contains the items that were exported from SystemWeaver and submitted to vTestStudio. In other words, you need to use the same item and version when you import as when you exported it to vTestStudio. Otherwise, the importer will produce this error message since it is unable to find the correct Test specifications and Test cases to put the results on. To locate the original in SystemWeaver, you can search for it using Open item>with ID and enter the Id that the importer says is missing. This should return the right version of the Test specification, and then you can backtrack if necessary.