# Problem as sometimes initialize() can't be called

**URL:** <https://forum.openzeppelin.com/t/problem-as-sometimes-initialize-cant-be-called/2169>\
**Category:** SDK\
**Created:** [January 28, 2020, 5:51pm UTC](https://forum.openzeppelin.com/t/problem-as-sometimes-initialize-cant-be-called/2169 "2020-01-28T17:51:09Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![lil](https://avatars.discourse-cdn.com/v4/letter/l/aeb1de/32.png) [@lil](https://forum.openzeppelin.com/u/lil)\
**Post date:** [January 28, 2020, 11:46pm UTC](https://forum.openzeppelin.com/t/problem-as-sometimes-initialize-cant-be-called/2169/3 "2020-01-28T23:46:19Z")

</div>

Hello @nventuro,

Yes sorry…

I will describe the scenario:

**State 1**  
Let’s say everything is going well, I run `oz create`  
I get something like

```auto
All contracts have been deployed
? Do you want to call a function on the instance after creating
 it? Yes
? Select which function (Use arrow keys)
❯ * initialize()
  * initialize(name: string, symbol: string)
* initialize(sender: address) 

```

(note the order, `initialize()` is first)

I run my truffle tests & even beyond that everything works fine.

**State 2**  
I have made some minor changes like adding a function at the end of the contract.  
If I don’t `oz upgrade`I usually clean up everything (artifacts & co) `rm build/contracts/* .openzeppelin/dev-*`  
I run `oz create`, everything goes well, but I notice that the functions order have changed… no problem it deploy and initialize anyway because I select my own initializer (`initialize()`)

```auto
All contracts have been deployed
? Do you want to call a function on the instance after creating
 it? Yes
? Select which function (Use arrow keys)
❯ * initialize(sender: address) 
  * initialize(name: string, symbol: string)
* initialize() 

```

Then this time everything go wrong with the truffle tests because when it run `let init = await instance.initialize({from: accounts[0]});`

```auto
Error: invalid address (arg="sender", coderType="address", value={"from":"0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1"})
     at PromiEvent (/home/me/.npm-global/lib/node_modules/truffle/build/webpack:/packages/contract/lib/promievent.js:6:1)
      at TruffleContract.initialize (/home/me/.npm-global/lib/node_modules/truffle/build/webpack:/packages/contract/lib/execute.js:157:1)
      at Context.it (test/thing.truffle.test1.js:15:31)
      at process._tickCallback (internal/process/next_tick.js:68:7)

```

when I do

```auto
$ oz send-tx
? Pick a network development
? Pick an instance Thing at 0xA57B8a5584442B467b4689F1144D269d096A3daF
? Select which function pause()
✖ Calling: 'pause' with no arguments
Error while trying to send transaction to 0xA57B8a5584442B467b4689F1144D269d096A3daF. Error: Returned error: VM Exception while processing transaction: revert PauserRole: caller does not have the Pauser role

```

Here is my 'initialize()` (the only one in my contract)

```auto
    function initialize() public initializer {
        ERC721.initialize();
        ERC721Enumerable.initialize();
        ERC721Metadata.initialize("XXX", "XXX");
        ERC721MetadataMintable.initialize(msg.sender);
        Pausable.initialize(msg.sender);
        Ownable.initialize(msg.sender); 
        ReentrancyGuard.initialize();
    }

```

It took me a lot of time to notice that every time things go wrong I noticed the order changed in `oz` interactive command…

What it could be is that sometimes for eg `ERC721.initialize()` will be called instead of `MyContract.initialize()` ??? (I only see 1 `initialize()` in the `oz` interactive command).

Anyway my simple solution is to initialize with a `initialize2()` I hope it is ok.

Apart from that I am a very happy user of OpenZeppelin SDK 🙂

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