issue with jsonmapper "Class \"\" does not exist"

[frozt86]

i got some issue when i call jsonrpc function that have some parameter that should be array like bellow

{ "jsonrpc": "2.0", "method": "createShippingVendor", "params": { "kode": "ARB", "nama": "Angkatan RB", "keterangan": "pangakalan surabaya", "catatan": "bisa titip", "area": [ {"id": "5310", "keterangan": "di ruteng"}, {"id": "5315", "keterangan": "di labuan bajo"}, {"id": "5319", "keterangan": "di borong"} ] }, "id": 2392 }

and then it throws an error like this

{ "jsonrpc": "2.0", "id": 2392, "error": { "message": "Server Fatal Error", "code": -32603, "data": { "errorMessage": "Class \"\" does not exist: /home/user/project/vendor/netresearch/jsonmapper/src/JsonMapper.php at line 655" } } }

currently i'm using Laravel (9.x) for the frameworks.