If you are experiencing issues accessing your previously saved invoices and cannot create new invoices due to a crash in the Joist App, follow these steps to resolve the problem:

1. Reopen the App: Close the Joist App completely and then reopen it. Sometimes, a simple restart can fix minor glitches.

2. Check for Updates: Ensure that you are using the latest version of the Joist App. Go to the app store on your device and check for any available updates. If an update is available, install it and then try accessing your invoices again.

3. Sign In to Your Account: Confirm that you are signed into the correct account. If you have multiple accounts, you might have accidentally logged into a different one. To check, go to the settings or profile section within the app and verify your login details. If you are logged out, sign back in before attempting to access your invoices - learn more.

4. Review Missing Invoices: If your invoices are still missing, check if they might have been accidentally deleted or if you created a new account instead. You cannot recover deleted invoices, so ensure to check your account thoroughly - learn more.

5. Clear Cache/Data (if applicable): If you're using a web browser, try clearing the browser cache and cookies. This can help resolve issues caused by corrupted data.

6. Reconnect to the Internet: Ensure that you have a stable internet connection. Sometimes, connectivity issues can cause apps to crash or fail to load necessary data properly.

7. Contact Support: If you have followed the previous steps and are still unable to access your invoices or create a new one, reach out to Joist's customer support for assistance. Provide them with details about your situation, including the error messages you encounter, if any.

8. Restart Your Device: If issues persist, restart your device, as this can help resolve temporary issues that might be affecting the app's performance.

Following these steps should help you regain access to your invoices and resolve any issues with creating new ones. If problems continue, professional support from Joist will be necessary to diagnose further - learn more.