diff --git a/code/userprog/exception.cc b/code/userprog/exception.cc
index b6e0247..67dc603 100644
--- a/code/userprog/exception.cc
+++ b/code/userprog/exception.cc
@@ -231,7 +231,7 @@ ExceptionHandler (ExceptionType which)
           {
             int s = machine->ReadRegister(4);
             char * command = new char[MAX_STRING_SIZE];
-            int size = copyStringFromMachine(s, command, MAX_STRING_SIZE);
+            copyStringFromMachine(s, command, MAX_STRING_SIZE);
             do_ForkExec(command);
             break;
           }
diff --git a/code/userprog/userthread.cc b/code/userprog/userthread.cc
index 2dc3b92..8de15db 100644
--- a/code/userprog/userthread.cc
+++ b/code/userprog/userthread.cc
@@ -92,9 +92,7 @@ void do_ThreadExit(){
         currentThread->space = NULL;
     }
 
-    DEBUG('x', "Thread killed!\n");
     currentThread->Finish();
-
     DEBUG('x', "Thread killed!\n");
 }
 
@@ -114,16 +112,15 @@ int do_ForkExec( const char * c){
 	file = fileSystem->Open(c);
 
 	if (file == NULL) {
-		printf("Unable to open file %s\n", file);	
+		printf("Unable to open file %s\n", c);	
 		return -1;
 	}
 		
     try { 
     	space = new AddrSpace(file);
     }catch(const std::bad_alloc& e) {
-    	printf("==> BAD ALLOC ERROR: no empty space\n");
-    	delete space;
-    	ASSERT(false);
+    	fprintf(stderr,"no empty space on memory\n");
+        Exit(1);
     }
     
 	fork = new Thread("forkThread");