# Error with with Merger from pycbc.catalog

**URL:** <https://ask.igwn.org/t/error-with-with-merger-from-pycbc-catalog/424>\
**Category:** Data Analysis\
**Created:** [August 12, 2022, 1:54pm UTC](https://ask.igwn.org/t/error-with-with-merger-from-pycbc-catalog/424 "2022-08-12T13:54:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ISABELP](https://avatars.discourse-cdn.com/v4/letter/i/b38774/32.png) [@ISABELP](https://ask.igwn.org/u/ISABELP)\
**Post date:** [August 12, 2022, 1:54pm UTC](https://ask.igwn.org/t/error-with-with-merger-from-pycbc-catalog/424/1 "2022-08-12T13:54:27Z")

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Hello,

I am following the tutorials from the workshop #5. In one of the tutorials of day 3, I am using the command ‘merger’ of pycbc.catalog. I noticed that the command works only for events of catalog gwtc-1. Is this because this command works only for educational purposes?

The reason I ask this is because I am trying to obtain the mass estimation for m1, m2 via pycbc inference tools as shown in the tutorials, for events from gwtc-2 and gwtc-3.

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**Author:** ![martinberoiz](https://yyz1.discourse-cdn.com/flex031/user_avatar/ask.igwn.org/martinberoiz/32/11_2.png) [@martinberoiz](https://ask.igwn.org/u/martinberoiz)\
**Post date:** [August 12, 2022, 4:42pm UTC](https://ask.igwn.org/t/error-with-with-merger-from-pycbc-catalog/424/2 "2022-08-12T16:42:10Z")

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Hello Isabel,

I think it should work for all catalogs.  
Can you show the code you used for gwtc-1 and the one you trying to use for gwtc-2 and 3?