Hello Eithan,
based on information in Problem view, I assume that this example has older setting for the path variable and it is pointing to wrong directory where compiler supposed to be.
Could you please check the setting for the Path, it should be ${ARM_TOOLCHAIN_DIR}/bin like on screenshot below:
if PATH setup properly, please check what value ARM_TOOLCHAIN_DIR variable has (go to Window->Preferences->Run/Debug->String Substitution)
