soapui 5.7.0 - mvn install error

Good morning

With:

- git version 2.28.0.windows.1

- mvn version 3.5.0

- java version 11.0.15

I download https://github.com/SmartBear/soapui/tree/release-5.7.0

and then I execute command:

mvn clean install in the root folder

I have obtaining the following error - see attachment.

can you help me please?

Thanks

Marco