# Undefined method 'uid' for nil::NilClass when running gem

**URL:** <https://www.ruby-forum.com/t/undefined-method-uid-for-nil-nilclass-when-running-gem/151883>\
**Category:** Ruby\
**Created:** [October 27, 2008, 2:55pm UTC](https://www.ruby-forum.com/t/undefined-method-uid-for-nil-nilclass-when-running-gem/151883 "2008-10-27T14:55:28Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![gaudimila](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/87869e/32.png) [@gaudimila](https://www.ruby-forum.com/u/gaudimila)\
**Post date:** [October 27, 2008, 2:55pm UTC](https://www.ruby-forum.com/t/undefined-method-uid-for-nil-nilclass-when-running-gem/151883/1 "2008-10-27T14:55:28Z")

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Just updated to gem 1.3.0 on XP.

> gem -v  
> 1.3.0

> gem list  
> ERROR: while executing gem …  
> undefined method ‘uid’ for nil::NilClass

Any ideas on this?

If I wanted to try an earlier version of gem instead, how do I revert  
exactly? I find the whole process of using gem-update gem files a bit  
confusing when it comes to a question like this.

Thanks!

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<div class="post-metadata">

**Author:** ![gaudimila](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/87869e/32.png) [@gaudimila](https://www.ruby-forum.com/u/gaudimila)\
**Post date:** [October 27, 2008, 5:00pm UTC](https://www.ruby-forum.com/t/undefined-method-uid-for-nil-nilclass-when-running-gem/151883/2 "2008-10-27T17:00:55Z")

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See this:  
[http://rubyforge.org/tracker/index.php?func=detail&aid=22226&group\_id=126&atid=575](http://rubyforge.org/tracker/index.php?func=detail&aid=22226&group_id=126&atid=575)

---

<div class="post-metadata">

**Author:** ![gaudimila](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/87869e/32.png) [@gaudimila](https://www.ruby-forum.com/u/gaudimila)\
**Post date:** [October 27, 2008, 5:20pm UTC](https://www.ruby-forum.com/t/undefined-method-uid-for-nil-nilclass-when-running-gem/151883/3 "2008-10-27T17:20:45Z")

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Thanks!

Luca P. wrote:

> See this:  
> [http://rubyforge.org/tracker/index.php?func=detail&aid=22226&group\_id=126&atid=575](http://rubyforge.org/tracker/index.php?func=detail&aid=22226&group_id=126&atid=575)