[Testnet] All Mosaic token gone with Internal Server Error

Hi, all my mosaics in my wallet with address TCKMEQCBHQZTELSYMPBGZB7W3UXAKRHSNSWV7U55, is not showing up. All the namespace is not expired but not one of it is listed in my wallet. Only xem is left.

When I check on the explorer (NEM - BlockChain Explorer), all the mosaics also not showing up, only namespace is shown.

Then, I try retrieve the mosaics owned by calling the NEM NIS api ( which return me “Internal Server Error” with status 500.

I tried to create a new token with the namespace available but it still not showing. Can I know whether this error is caused by your side? Since the api is returning “Internal Server Error”.