# Can not generate a CHangelog from an existing Postgress Database.

**URL:** <https://forum.liquibase.org/t/can-not-generate-a-changelog-from-an-existing-postgress-database/2937>\
**Category:** General Discussion\
**Created:** [March 19, 2014, 9:04am UTC](https://forum.liquibase.org/t/can-not-generate-a-changelog-from-an-existing-postgress-database/2937 "2014-03-19T09:04:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![kim.strong](https://avatars.discourse-cdn.com/v4/letter/k/958977/32.png) [@kim.strong](https://forum.liquibase.org/u/kim.strong)\
**Post date:** [March 19, 2014, 9:04am UTC](https://forum.liquibase.org/t/can-not-generate-a-changelog-from-an-existing-postgress-database/2937/1 "2014-03-19T09:04:00Z")

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Hi&nbsp;

I am running a&nbsp;

Postgress Server (EnterpirseDB 9.3.1.3 on x86\_64-unknown-linux-gnu, compiled by gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-52), 64-bit)

I am using Liquibase version 3.1.1

Within the database “Demo\_034PWL”, I have has 4 schemas:&nbsp;

-  

 

 

Please can anyone make a suggestion why the liquibase is not generating a changelog file.

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**Author:** ![un1382561729492r88id](https://avatars.discourse-cdn.com/v4/letter/u/c4cdca/32.png) [@un1382561729492r88id](https://forum.liquibase.org/u/un1382561729492r88id)\
**Post date:** [March 19, 2014, 9:04am UTC](https://forum.liquibase.org/t/can-not-generate-a-changelog-from-an-existing-postgress-database/2937/2 "2014-03-19T09:04:00Z")

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This looks like a classpath issue - liquibase isn’t finding all the classes it needs to run. One thing you could do to diagnose it would be to edit the liquibase shell script and have it echo out the value of LIQUIBASE\_HOME to make sure that is set correctly, and then to also have it echo the value of CP, which is the set of jars that are used for the classpath.&nbsp;