# Unable to start flowable 6.3.0 wars: liquibase-core-3.5.3.jar snakeyaml-1.13.jar

**URL:** <https://forum.flowable.org/t/unable-to-start-flowable-6-3-0-wars-liquibase-core-3-5-3-jar-snakeyaml-1-13-jar/1922>\
**Category:** Flowable Engine\
**Created:** [April 20, 2018, 11:51am UTC](https://forum.flowable.org/t/unable-to-start-flowable-6-3-0-wars-liquibase-core-3-5-3-jar-snakeyaml-1-13-jar/1922 "2018-04-20T11:51:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![naeem](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.flowable.org/naeem/32/3658_2.png) [@naeem](https://forum.flowable.org/u/naeem)\
**Post date:** [April 20, 2018, 11:51am UTC](https://forum.flowable.org/t/unable-to-start-flowable-6-3-0-wars-liquibase-core-3-5-3-jar-snakeyaml-1-13-jar/1922/1 "2018-04-20T11:51:25Z")

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Hi. Trying to start flowable 6.3.0 from downloaded war files. Getting this error (using jetty):

The Class-Path manifest attribute in /tmp/jetty-0.0.0.0-9080-flowable-admin.war-\_flowable-admin-any-2999565491641849289.dir/webapp/WEB-INF/lib/liquibase-core-3.5.3.jar referenced one or more files that do not exist: file:/tmp/jetty-0.0.0.0-9080-flowable-admin.war-\_flowable-admin-any-2999565491641849289.dir/webapp/WEB-INF/lib/lib/snakeyaml-1.13.jar  
java.lang.IllegalArgumentException: Unable to find the main class to restart  
at org.springframework.util.Assert.notNull(Assert.java:193)  
at org.springframework.boot.devtools.restart.Restarter.doStart(Restarter.java:275)  
at org.springframework.boot.devtools.restart.Restarter.start(Restarter.java:263)  
at org.springframework.boot.devtools.restart.Restarter.lambda$immediateRestart$0(Restarter.java:171)  
at org.springframework.boot.devtools.restart.Restarter$LeakSafeThread.run(Restarter.java:616)

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**Author:** ![yvo](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.flowable.org/yvo/32/2231_2.png) [@yvo](https://forum.flowable.org/u/yvo)\
**Post date:** [April 20, 2018, 1:27pm UTC](https://forum.flowable.org/t/unable-to-start-flowable-6-3-0-wars-liquibase-core-3-5-3-jar-snakeyaml-1-13-jar/1922/2 "2018-04-20T13:27:52Z")

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Hi,

It may be an issue with Jetty caused by the fact that these are executable wars. (meaning you can start them with java -jar \*.war without deploying them on Jetty).  
I’ll look into it.

Regards,

Yvo