Frequently Asked Questions (FAQs)

Q1. Why can’t I click the “Enable Group” button?

A1. One of the following reasons may apply:

①　A payment method has not been set.

②　A payment method has been set, but no payment has been made yet.

③　The most recent payment has failed.

In the above cases, you will not be able to create a project group.

Please check your payment method settings and payment status.

For more details, please check Billing Account Management

Q2. How long does it take to deploy a function?

A2. Deployment takes a few minutes, not seconds. The environment has to be built before the function can run.

A deployment that has been going for a few minutes is normal and does not need to be retried. See Create Function.

Q3. How can I tell whether a deployment actually succeeded?

A3. Open the function and check the Invocation tab. If the function can be invoked there, the deployment succeeded.

Do not judge success by Last Deployed Time. That field records the most recent deployment attempt, so it is also set when a deployment fails. See Function Details.

Q4. Why can't I see the Deploy button?

A4. You do not have the Functions → Deploy permission.

Deploy is not part of the default permission set for a new project member — neither are Invoke and Delete. A Project Admin has to grant it. Until then the control is hidden or disabled rather than showing an error. See Project Permissions.

Q5. I deleted a function by mistake. Can I get it back?

A5. Yes. Deleting a function moves it to the Function Trash, where it can be restored. See Function Trash.

Q6. I deleted a project by mistake. Can I get it back?

A6. Not by yourself. Deleting a project cannot be undone — every function and job inside it is removed immediately. Only a System Admin can recover a project, so contact support as soon as possible. See Manage Project.

Q7. Why does the platform stop at "Choose Your Project" when I log in?

A7. Your active project no longer exists — this normally happens after deleting the project you were working in. Pick another project to continue.

If you cannot see the project you want, use the search box: the page lists only the 20 most recent projects, and typing a name and pressing Enter searches beyond them.

Q8. Why is a project I deleted still shown in the project list?

A8. Deleted projects stay in the All Projects table with the status DELETED, for reference only. No actions are available on them. This is expected and does not mean the deletion failed.

Q9. Can I reuse the name of a deleted project?

A9. No. Deleted project names cannot be reused. Choose a different name for the new project.

Q10. My job has been Queued for a long time. Is it stuck?

A10. Probably not. A job on real quantum hardware waits for the device, and that wait depends on how busy the machine is and on its availability window. A long Queued state is normal on a QPU.

See Job Queue for what each state means.

Q11. Why was my invocation blocked by a quota error?

A11. A project quota has been reached. Quotas apply per project, and there are several kinds — jobs per day, jobs per month, and free simulator minutes.

You can either wait for the reset cycle (daily or monthly) or request an increase. See Project Quota.

Q12. I registered my own provider credential but still cannot invoke a function. Why?

A12. The credential is most likely Unverified. A credential in that state does not allow invocation — it has to be tested successfully against the provider first.

See Workspace Provider Credentials for the credential states and what each one allows.

Q13. Can I use JupyterLab and VS Code at the same time?

A13. No. Only one IDE session can be active for a function at a time. Choosing the other editor ends the running session, so save your work before you switch. See Browser IDE.

Q14. Why does Quapp still report an IDE session as running after I closed it?

A14. The session was not ended properly. Closing the browser tab, or closing a panel inside VS Code, does not end the managed session on the server.

Leave the IDE with Quapp's own close control — the one outside the editor.

Q15. Does restarting a failed workflow re-run only the step that failed?

A15. No. A restart re-executes the workflow from the first step, using the same input as the original run. Steps that had already succeeded run again and consume quota again. See Workflows.

Q16. Why can't I find a conversation by searching for something written inside it?

A16. AI Chat search matches the conversation title only, not the text of the messages. Search for a word from the title instead. See AI Chat.

Q17. What happens if I go over my storage allowance?

A17. Nothing stops working. Going over the included storage adds an overage charge to the subscription instead of blocking your functions.

Check Current Usage to see how close you are, and Resource Usage to find which projects are consuming the most. See Subscription Storage Usage.

Q18. Where do I look up an error code I received?

A18. The Error Code Reference section documents each code together with its root cause and resolution. The pages most often needed are:

Q19. Why don't I see AI Chat?

A19. AI Chat requires an eligible subscription — the AI add-on on a Premium plan. Accounts without it do not see the feature. The add-on can also be selected for a user at the time they are invited to a workspace.