Error:org/apache/tools/ant/taskdefs/Ant

Hi, I have same issue ext.cubaVersion 6.10 project in the new Cuba Studio 2019.1 studio and when I try to build the project I’m getting the following error: Error:org/apache/tools/ant/taskdefs/Ant any help will be fully appreciated.

Hi @sulemenov.a

Can you clarify: you open an old project on a 6.10 platform or you create a new one?
Also, a log would be useful. You can find it by “Help -> Show Log” action