The twl goal takes a file from a folder specified in the pom and generates a word list in twl format. That file is always written to the top of the resources folder for generated resources. But it should be written to a subfolder of the resource folder reflecting the package structure.
For example, if the simple list file resides in src/main/resources/my/package the corresponding twl file is written to target/generated-sources/ruta/resources. But it should be written to target/generated-sources/ruta/resources/my/package.
This is very important for projects with many dependencies where different resources from different packages but with the same name can occur.