This is most likely due to changes in the Uniprot endpoints.
- The tool should update to the latest uniprot-japi-1.1.1 library which was released end of May. This will most likely support the latest service endpoints (I have/had similar issues with uniprot with outdated uniprot-japi versions, so one should update the tools as soon as a new data and software release is provided by uniprot)
- If PhosphoPath is using the REST webservice directly most likely the service was updated and now some queries are failing.
I can confirm that Uniprot queries are failing via the uniprot-japi at the moment (via another tool cy3sbml). If you are lucky it is only a temporary issue/bug with the services, otherwise you have to open an issue with the PhosphoPath tool to update the uniprot-japi or webservices.
Best Matthias