Add new type of errror

src/com/sheepit/client/Client.java

@@ -345,7 +345,7 @@ public class Client {
 						ret = confirmJob(this.renderingJob);
 						if (ret != Error.Type.OK) {
 							gui.error("Client::run problem with confirmJob (returned " + ret + ")");
-							sendError(step);
+							sendError(step, this.renderingJob, Error.Type.VALIDATION_FAILED);
 						}
 					}
 					else {

src/com/sheepit/client/Error.java

@@ -48,6 +48,7 @@ public class Error {
 		OS_NOT_SUPPORTED(17),
 		CPU_NOT_SUPPORTED(18),
 		GPU_NOT_SUPPORTED(19),
+		VALIDATION_FAILED(25),
 		
 		// internal error handling
 		NO_SPACE_LEFT_ON_DEVICE(100),