Parse server error: Uncaught internal server error. {“stack”:“Error”} - parse-platform

Question

I have user import query:
const userObj = Parse.Object.extend("User");
var addingList = [];
for (var i = 0; i < downloadedCustomers.length; i++) {
var user = new userObj();
user.set("username", downloadedCustomers[i].cardcode);
user.set("password", downloadedCustomers[i].password);
user.set('name', downloadedCustomers[i].cardname);
addingList.push(user)
user.save( { useMasterKey: true }).then((success)=>{
console.log(success)
}).catch((error)=>{
console.log(error)
})
}
when i use this code on array, sometimes gives
error: Uncaught internal server error. {“stack”:“Error”} on some keys, but sometimes successfully saves all keys.
if i use :
Parse.Object.saveAll(addingList, { useMasterKey: true })
somekeys got saved, still some not saved.
How can i import all keys successful everytime?
PS: same situation on user.signUp()

Answer 1

I fixed it dividing object requests into 10 pieces of chunks.
Seems parse user object saving needs time process and resolve.
for (h = 0, k = addingList.length; h < k; h += chunk2) {
temparray = addingList.slice(h, h + chunk2);
await Parse.Object.saveAll(temparray,{useMasterKey:true}).then((success) => {
console.log(h + chunk2 + ’ customers were added from total ’ + k);
return h + chunk2 + ’ customers were added from total ’ + k
}).catch((error) => {
console.log('Some customers were failed to import in chunk : ’ + h + ‘. Error:’ + error);
console.log(error)
return 'Some customers were failed to import in chunk : ’ + h + ‘. Error:’ + error
});
}
Chunk size should be below 20, because it's Default object array limit in saveAll() function.