# pt-online-schema-change fails?

**URL:** <https://forums.percona.com/t/pt-online-schema-change-fails/3146>\
**Category:** Percona Toolkit\
**Created:** [December 11, 2013, 1:16am UTC](https://forums.percona.com/t/pt-online-schema-change-fails/3146 "2013-12-11T01:16:01Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![vicary](https://avatars.discourse-cdn.com/v4/letter/v/b487fb/32.png) [@vicary](https://forums.percona.com/u/vicary)\
**Post date:** [December 11, 2013, 1:16am UTC](https://forums.percona.com/t/pt-online-schema-change-fails/3146/1 "2013-12-11T01:16:01Z")

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I am trying with your tool pt-online-schema-change, but it fails to compile at line 3641.

I tried to create an index with it, here is a copy of the error message.

> [@](#):
>
> Can’t locate Time/HiRes.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor\_perl /usr/share/perl5/vendor\_perl /usr/lib64/perl5 /usr/share/perl5 .) at ./pt-online-schema-change line 3641.  
> BEGIN failed–compilation aborted at ./pt-online-schema-change line 3641.

Am I missing anything? Like perl modules?

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**Author:** ![mirfan](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/mirfan/32/16890_2.png) [@mirfan](https://forums.percona.com/u/mirfan)\
**Post date:** [December 11, 2013, 2:40pm UTC](https://forums.percona.com/t/pt-online-schema-change-fails/3146/2 "2013-12-11T14:40:15Z")

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Look likes you are missing Time-HiRes module. If you are on RHEL/CentOS box install it first as follows and retry.

$ yum install Time-HiRes