"Schema frozen" error during Twitter/Facebook Login

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Issue Description

When logging in through Twitter or Facebook, I get an error.

Steps to reproduce

1. Login in to Twitter/Facebook through PFLoginViewController

Expected Results

Successful login

Actual Outcome

error message: "schema is frozen, cannot add: _Session"

Environment Setup

• Server
  • parse-server version: 2.2.11
  • Operating System: Ubuntu 15.10
  • Hardware: 4 GB Memory / 60 GB Disk / NYC3
  • Localhost or remote server? (AWS, Heroku, Azure, Digital Ocean, etc): Digital Ocean
• Database
  • MongoDB version: 3.2.7
  • Storage engine: N/A
  • Hardware: 4 GB Memory / 60 GB Disk / NYC3
  • Localhost or remote server? (AWS, mLab, ObjectRocket, Digital Ocean, etc): Digital Ocean

Logs/Trace

You can turn on additional logging by configuring VERBOSE=1 in your environment.

Error message above on client-side visible.

Comments

I have looked through other issues with similar symptoms but have not found a solution. The closest issue I came across was #1957, specifically the comment from @Nightsd01 where he encounters the same issue. The solution presented by @BrainDDump doesn't apply and seems unrelated.

Though I must note that in one of my functions, I do use an Array.protype

Array.prototype.randomElement = function () {
    return this[Math.floor(Math.random() * this.length)]
}

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Additional Comment:

I tried to rename that randomElement() because I thought maybe somewhere else that was defined and clashed so I change it to something random, that didn't work. Changed it back to randomElement() and restarted the server, now login works

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Update:

This issue can be closed. As mentioned above, renaming that function and setting it back. Then restarting the server a couple of times has solved the problem. Its a weird glitch but this issue can serve as an FYI for the future.