java.lang.String cannot be cast to org.servebox.flex.mojo.FlexLicense

Olá, aconteceu comigo agora o erro:

java.lang.ClassCastException: java.lang.String cannot be cast to org.servebox.flex.mojo.FlexLicense
at org.servebox.flex.mojo.base.AbstractFlexMakeMojo.handleCompilationOptions(AbstractFlexMakeMojo.java:1142)
at org.servebox.flex.mojo.base.AbstractFlexMakeMojo.handleConfiguration(AbstractFlexMakeMojo.java:990)
at org.servebox.flex.mojo.base.AbstractFlexMakeMojo.invokeCompiler(AbstractFlexMakeMojo.java:923)
at org.servebox.flex.mojo.MakeSWFMojo.invokeCompiler(MakeSWFMojo.java:105)
at org.servebox.flex.mojo.base.AbstractFlexMakeMojo.compile(AbstractFlexMakeMojo.java:858)
at org.servebox.flex.mojo.MakeSWFMojo.compile(MakeSWFMojo.java:113)

O erro aconteceu pois eu usei a tag abaixo:
<licenses>
<flexbuilder3>1111-1111-1111-1111-1111-1111</flexbuilder3>
</licenses>

Mas deveria ter usado da seguinte forma:
<flex3LicenceKey>1111-1111-1111-1111-1111-1111</flex3LicenceKey>

Ambas as formas estavam dentro de <plugin> e dentro de <configuration>

Vaaleu!