Forum: System Workbench for STM32

New User : Build Fails

I have just downloaded System Workbench and created a project. I open main.c and do project-> build but get an error:-

Errors occurred during the build.
Errors running builder ‘CDT Builder’ on project ‘stm32l0538discovery_hal_lib’.
A resource already exists on disk ‘C:\Users\patm\workspaceST\stm32l0538discovery_hal_lib\Debug\sources.mk’.
A resource already exists on disk ‘C:\Users\patm\workspaceST\stm32l0538discovery_hal_lib\Debug\sources.mk’.

Any ideas on what the problem could be ?