[openstreetmap-website] Undefined method when trying to edit (#1072)

[adam21]

Hello everyone,

I used the example below to configure potlatch2 editor  : 

```
# Default editor
default_editor: "potlatch2"
# OAuth consumer key for Potlatch 2
potlatch2_key: "8lFmZPsagHV4l3rkAHq0hWY5vV3Ctl3oEFY1aXth"
```

But when trying to edit with potlatch2, I get this error message : 

![image](https://cloud.githubusercontent.com/assets/11215545/10578040/d8892862-766f-11e5-86ce-2028900b8e84.png)

The error is saying that the method "access_token_for_ser" , Do you have any idea please ? 

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/1072
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