I run Testcase but i don't know what the error is

[Luyen_Anh_Nguyet (Luyện Ánh Nguyệt)]

When I run testcase I get error like this

[1412_Sony]

You try to use a clean java workspace on manage tab, don’t u?

[linhntk (Louisyna)]

The message said that use should try “clean java workspace”