# Issues to upgrade from 3.x to 4.x and above

**URL:** <https://forums.rocket.chat/t/issues-to-upgrade-from-3-x-to-4-x-and-above/16767>\
**Category:** Community Support\
**Created:** [May 12, 2023, 7:57am UTC](https://forums.rocket.chat/t/issues-to-upgrade-from-3-x-to-4-x-and-above/16767 "2023-05-12T07:57:18Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Christian](https://avatars.discourse-cdn.com/v4/letter/c/b2d939/32.png) [@Christian](https://forums.rocket.chat/u/Christian)\
**Post date:** [May 12, 2023, 7:57am UTC](https://forums.rocket.chat/t/issues-to-upgrade-from-3-x-to-4-x-and-above/16767/1 "2023-05-12T07:57:18Z")

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Hello,

i´ve issues to uprade RocketChat from 3.x to 4.x by using snap. I alraedy have switch the track and update RC. But on starting after installation, some issues will apper and RC doesnt start. What can i do to upgrade finally to track 6? Sure, that i will install ech mayor version to 6.

Issues:

May 11 21:19:31 chat.uuuuu rocketchat-server.rocketchat-server[4654]: Error: Can’t find migration version 237

May 11 21:25:19 chat.uuuuu rocketchat-server.rocketchat-server[5087]: {“level”:40,“time”:“2023-05-11T19:25:19.634Z”,“pid”:5160,“hostname”:“chat.uuuuu”,“name”:“Migrations”,“msg”:“Not migrating, control is locked. Attempt 2/30. Trying again in 10 seconds.”}  
May 11 21:25:29 chat.uuuuu rocketchat-server.rocketchat-server[5087]: {“level”:40,“time”:“2023-05-11T19:25:29.642Z”,“pid”:5160,“hostname”:“chat.uuuuu”,“name”:“Migrations”,“msg”:"Not migrating, control is locked. Attempt 3/30. Trying again in 10 secon

// May 11 21:18:30 chat.uuuuu systemd[1]: Stopping Service for snap application rocketchat-server.rocketchat-server…  
May 11 21:18:30 chat.uuuuu systemd[1]: Stopped Service for snap application rocketchat-server.rocketchat-server.  
May 11 21:18:36 chat.uuuuu systemd[1]: Started Service for snap application rocketchat-server.rocketchat-server.  
May 11 21:18:36 chat.uuuuu rocketchat-server.rocketchat-server[3152]: node $SNAP/main.js  
May 11 21:18:48 chat.uuuuu rocketchat-server.rocketchat-server[3152]: Some indexes for collection ‘rocketchat\_nps\_vote’ could not be created:  
May 11 21:18:48 chat.uuuuu rocketchat-server.rocketchat-server[3152]: Index with name: npsId\_1\_identifier\_1 already exists with different options  
May 11 21:18:48 chat.uuuuu rocketchat-server.rocketchat-server[3152]: Some indexes for collection ‘rocketchat\_integration\_history’ could not be created:  
May 11 21:18:48 chat.uuuuu rocketchat-server.rocketchat-server[3152]: Index with name: \_updatedAt\_1 already exists with different options  
May 11 21:18:49 chat.uuuuu rocketchat-server.rocketchat-server[3152]: Error creating index: users → { bio: 1 } { sparse: 1 } MongoServerError: Index with name: bio\_1 already exists with different options  
May 11 21:18:49 chat.uuuuu rocketchat-server.rocketchat-server[3152]: at MessageStream.messageHandler (/snap/rocketchat-server/1540/programs/server/npm/node\_modules/meteor/npm-mongo/node\_modules/mongodb/lib/cmap/connection.js:462:30)  
May 11 21:18:49 chat.uuuuu rocketchat-server.rocketchat-server[3152]: at MessageStream.emit (events.js:400:28)  
May 11 21:18:49 chat.uuuuu rocketchat-server.rocketchat-server[3152]: at MessageStream.emit (domain.js:475:12)  
May 11 21:18:49 chat.uuuuu rocketchat-server.rocketchat-server[3152]: at processIncomingData (/snap/rocketchat-server/1540/programs/server/npm/node\_modules/meteor/npm-mongo/node\_modules/mongodb/lib/cmap/message\_stream.js:108:16)

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**Author:** ![leojack1272](https://sea1.discourse-cdn.com/flex021/user_avatar/forums.rocket.chat/leojack1272/32/4664_2.png) [@leojack1272](https://forums.rocket.chat/u/leojack1272)\
**Post date:** [May 13, 2023, 5:09pm UTC](https://forums.rocket.chat/t/issues-to-upgrade-from-3-x-to-4-x-and-above/16767/2 "2023-05-13T17:09:35Z")

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I also recommend the [Lemot WordLe Francias](https://wordlefrancais.online/) Puzzle game if you want to check your IQ level. don’t forget to try it at once. I hope you enjoy this.