# Migrating from Classic Error 1035 and 1003 (Sheets) **URL:** \ **Category:** Ask for Help\ **Created:** [January 30, 2024, 6:36am UTC](https://community.glideapps.com/t/migrating-from-classic-error-1035-and-1003-sheets/70237 "2024-01-30T06:36:53Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![xzab](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/xzab/32/42734_2.png) [@xzab](https://community.glideapps.com/u/xzab)\ **Post date:** [January 30, 2024, 6:36am UTC](https://community.glideapps.com/t/migrating-from-classic-error-1035-and-1003-sheets/70237/1 "2024-01-30T06:36:53Z")
I’m trying to migrate an app from classic and I’m getting 1003 when trying to create a new app from data: ![image](https://us1.discourse-cdn.com/flex002/uploads/glideapps/original/3X/c/6/c65038119ca59a949fe70ce185d8ad06f5090e43.png) I went through google sheets and cleared all of the extra empty rows and columns and then realized it wasn’t even syncing anymore: ![image](https://us1.discourse-cdn.com/flex002/uploads/glideapps/original/3X/0/2/02645a20d57ac169a4555d41f5355b0113483725.png) I followed this thread: [https://community.glideapps.com/t/glide-and-sheet-not-in-sync-error-1003-and-1035/67737](https://community.glideapps.com/t/glide-and-sheet-not-in-sync-error-1003-and-1035/67737) and emptying cache/cookies/signing back in with google did not work for me. I checked google permissions and glide still has access (and the sheet never moved or changed permissions). But I also noticed when I try to go to settings \> data sources \> replace, it prompts the google auth windows, but after I grant access nothing happens. It never gives me an option to select a sheet (isn’t it supposed to?). I was trying to see if I could copy the sheet EXACTLY per another thread and I can’t even get that to work because I can’t change data sources. I did not want to _remove_ data source because it says it’ll remove all components. I just want to get my app out of classic — any suggestions? Thanks in advance. ---
**Author:** ![nathanaelb](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/nathanaelb/32/43079_2.png) [@nathanaelb](https://community.glideapps.com/u/nathanaelb)\ **Post date:** [January 30, 2024, 1:14pm UTC](https://community.glideapps.com/t/migrating-from-classic-error-1035-and-1003-sheets/70237/2 "2024-01-30T13:14:06Z")
**In short: export tabs to CSV fils and import the CSV files to Glide Tables.** You could try the following: - Create a blank app - Create Glide Tables and as many tables as you have tabs in Google Sheets. Name these tables the same as the tabs. - Export each tab in Google Sheets to a CSV file. - Import each file to its own Glide Table. Of course this is not a quick as creating a new app from data, but hopefully export and importing each tab would work. ---
**Author:** ![MattLB](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/mattlb/32/41284_2.png) [@MattLB](https://community.glideapps.com/u/MattLB)\ **Post date:** [January 30, 2024, 2:05pm UTC](https://community.glideapps.com/t/migrating-from-classic-error-1035-and-1003-sheets/70237/3 "2024-01-30T14:05:09Z")
In my case there was a weird authentication issue. I am not sure what EXACTLY happened but… I had to do an ad-hoc demo on another person’s laptop so I signed into my Glide account on their laptop using google which authenticate to my phone. Being paranoid I logged out of all devices for google (logging out ALL google apps including drive) and then reset my google password. At this point I believe I disconnect the authentication between google and Glide. Everything had access - but could not authenticate. So google tables failed and Glide tables worked. After a panic of a day (clearing caches and all the other activities) I signed into Glide using my google account (not email which I normally do) and access to drive/sheets worked. I had somehow disconnected authentication between Google and Glide and thankfully got reconnected when I used Google authentication to sign into Glide. BTW - this is the thread where I described the process that I used to clear google off all devices/services (and which caused all my problems) if that helps. [Log out all developers - #6 by MattLB](https://community.glideapps.com/t/log-out-all-developers/67639/6) Good luck! ---
**Author:** ![Darren\_Murphy](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/darren_murphy/32/47326_2.png) [@Darren\_Murphy](https://community.glideapps.com/u/Darren_Murphy)\ **Post date:** [January 30, 2024, 2:18pm UTC](https://community.glideapps.com/t/migrating-from-classic-error-1035-and-1003-sheets/70237/4 "2024-01-30T14:18:38Z")
> [@MattLB](#): > > After a panic of a day (clearing caches and all the other activities) I signed into Glide using my google account (not email which I normally do) and access to drive/sheets worked. I had somehow disconnected authentication between Google and Glide and thankfully got reconnected when I used Google authentication to sign into Glide. I think there is a lesson there. Always sign into Glide using your Google account 🙂