# a problem with chimera.uchime command

**URL:** <https://forum.mothur.org/t/a-problem-with-chimera-uchime-command/2530>\
**Category:** Commands in mothur\
**Created:** [September 15, 2015, 3:36pm UTC](https://forum.mothur.org/t/a-problem-with-chimera-uchime-command/2530 "2015-09-15T15:36:21Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Tom42](https://avatars.discourse-cdn.com/v4/letter/t/ea666f/32.png) [@Tom42](https://forum.mothur.org/u/Tom42)\
**Post date:** [September 15, 2015, 3:36pm UTC](https://forum.mothur.org/t/a-problem-with-chimera-uchime-command/2530/1 "2015-09-15T15:36:21Z")

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Hello everybody,

I have done the chimera.uchime command and it sais i need uchime.exe , my question is: isn’t it the ref file?? shall i just change the name of it??  
before it i did:  
unique.seqs  
count.seqs  
align.seqs  
screen.seqs  
filter.seqs  
unique.seqs

  
thank you :)

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**Author:** ![Tom42](https://avatars.discourse-cdn.com/v4/letter/t/ea666f/32.png) [@Tom42](https://forum.mothur.org/u/Tom42)\
**Post date:** [September 16, 2015, 11:23am UTC](https://forum.mothur.org/t/a-problem-with-chimera-uchime-command/2530/2 "2015-09-16T11:23:27Z")

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anyone please?

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**Author:** ![westcott](https://yyz2.discourse-cdn.com/flex036/user_avatar/forum.mothur.org/westcott/32/18_2.png) [@westcott](https://forum.mothur.org/u/westcott)\
**Post date:** [September 17, 2015, 4:40pm UTC](https://forum.mothur.org/t/a-problem-with-chimera-uchime-command/2530/3 "2015-09-17T16:40:22Z")

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The uchime executable is available with the executable versions of mothur, [https://github.com/mothur/mothur/releases/tag/v1.36.1](https://github.com/mothur/mothur/releases/tag/v1.36.1). It will also be built if you build from source. Most of the time when mothur can not find the uchime executable it is because the mothur executable has been moved. You can resolve this issue by moving the uchime executable to where mothur is.

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**Author:** ![Tom42](https://avatars.discourse-cdn.com/v4/letter/t/ea666f/32.png) [@Tom42](https://forum.mothur.org/u/Tom42)\
**Post date:** [September 18, 2015, 11:48am UTC](https://forum.mothur.org/t/a-problem-with-chimera-uchime-command/2530/4 "2015-09-18T11:48:03Z")

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Oh i haven’t seen the uchime file in the mothur.rar file. thank you !