I've just uploaded a new release of this plugin which fixes processing of multiple weather stations with the same owner. This necessitated changing the address nomenclature for weather station modules, so:
*** PLEASE NOTE ***
Before installing this release it is necessary to delete or rename all existing weather station modules (but not stations) with addresses starting 'WSM' to allow creation of new modules with a revised address nomenclature. Failure to do this will result in 'name not unique' errors. Note that any renamed devices will no longer be updated.