DbUnit Tests with SilkCentral

I´m trying to execute DbUnit Tests with SilkCentral in a remote Virtual Machine that works like a execution server. The Alltests.class directory is in \\p6621va\ucd\ucdmain_TEST\bin\es\bde\aps\ucdmain\ias\tests\AllTests.class and it contents the suiteTests. I need to specify the AllTests.class Classpath , I`ve done like this according the documentation:

It returns the following error:

How can I specify the Classpath?

Thanks in advance.