FormEngines.getDefaultFormEngine() returns NULL

Flowable Engine
4

Thanks @tijs, the dependency solved the error. However, now I had another one:

11:15:54,120 [main] ERROR org.flowable.form.engine.FormEngines  - Exception while initializing form engine: Error initialising form data schema
org.flowable.engine.common.api.FlowableException: Error initialising form data schema
	at org.flowable.form.engine.FormEngineConfiguration.initDbSchema(FormEngineConfiguration.java:305)
	at org.flowable.form.engine.FormEngineConfiguration.init(FormEngineConfiguration.java:191)
	at org.flowable.form.engine.FormEngineConfiguration.buildFormEngine(FormEngineConfiguration.java:174)
	at org.flowable.form.engine.FormEngines.buildFormEngine(FormEngines.java:164)
	at org.flowable.form.engine.FormEngines.initFormEngineFromResource(FormEngines.java:144)
	at org.flowable.form.engine.FormEngines.init(FormEngines.java:76)
	at org.flowable.form.engine.FormEngines.getFormEngine(FormEngines.java:198)
	at org.flowable.form.engine.FormEngines.getDefaultFormEngine(FormEngines.java:187)
	at org.flowable.CallForForecasts.main(CallForForecasts.java:17)
Caused by: liquibase.exception.ChangeLogParseException: Error Reading Migration File: Found 3 files that match org/flowable/form/db/liquibase/flowable-form-db-changelog.xml
	at liquibase.parser.core.xml.XMLChangeLogSAXParser.parseToNode(XMLChangeLogSAXParser.java:112)
	at liquibase.parser.core.xml.AbstractChangeLogParser.parse(AbstractChangeLogParser.java:17)
	at liquibase.Liquibase.getDatabaseChangeLog(Liquibase.java:229)
	at liquibase.Liquibase.update(Liquibase.java:202)
	at liquibase.Liquibase.update(Liquibase.java:192)
	at liquibase.Liquibase.update(Liquibase.java:188)
	at liquibase.Liquibase.update(Liquibase.java:181)
	at org.flowable.form.engine.FormEngineConfiguration.initDbSchema(FormEngineConfiguration.java:299)
	... 8 more
Caused by: java.io.IOException: Found 3 files that match org/flowable/form/db/liquibase/flowable-form-db-changelog.xml
	at liquibase.util.StreamUtil.singleInputStream(StreamUtil.java:205)
	at liquibase.parser.core.xml.XMLChangeLogSAXParser.parseToNode(XMLChangeLogSAXParser.java:93)
	... 15 more

I read in a post a similar situation but I don’t know it was finally solved. I checked the flowable-form-db-changelog.xml and in effect, there are 3 files with this name (I’m working with version 6.2.0).