diff --git a/src/sfTk/sfTkIBus.h b/src/sfTk/sfTkIBus.h
index 5536dff..dd2add7 100644
--- a/src/sfTk/sfTkIBus.h
+++ b/src/sfTk/sfTkIBus.h
@@ -62,6 +62,12 @@ const sfTkError_t ksfTkErrBusUnderRead = ksfTkErrBaseBus + 7;
  */
 const sfTkError_t ksfTkErrBusNotEnabled = ksfTkErrBaseBus + 8;
 
+/**
+ * @brief Returned when the data received is not valid or does not match the expected format.
+ * 
+ */
+const sfTkError_t ksfTkErrBusBadData = ksfTkErrFail * (ksfTkErrBaseBus + 9);
+
 /**
  * @brief Interface that defines the communication bus for the SparkFun Electronics Toolkit.
  *
diff --git a/src/sfTk/sfTkISerialBus.h b/src/sfTk/sfTkISerialBus.h
index 0ece81d..5ec7446 100644
--- a/src/sfTk/sfTkISerialBus.h
+++ b/src/sfTk/sfTkISerialBus.h
@@ -21,7 +21,7 @@
 
 const uint8_t ksfTkBusTypeSerialBus = 0x03;
 
-class sfTkISerialBus : sfTkIBus
+class sfTkISerialBus : public sfTkIBus
 {
   public:
     /**
diff --git a/tests/test_uart/test_uart.ino b/tests/test_uart/test_uart.ino
index e49b502..4f364a4 100644
--- a/tests/test_uart/test_uart.ino
+++ b/tests/test_uart/test_uart.ino
@@ -2,6 +2,10 @@
 
 #include "SparkFun_Toolkit.h"
 
+#ifndef USER_SW
+#define USER_SW 9
+#endif
+
 sfTkArdUART myUART;
 sfTkArdUART myExtUART(Serial1);
 sfTkArdUARTBus serialBus1(myExtUART);
@@ -14,7 +18,6 @@ bool buttonPressed = false;
 
 void setup() {
   pinMode(LED_BUILTIN, OUTPUT);
-  pinMode(PIN_WL_LED, OUTPUT);
   pinMode(USER_SW, INPUT);
   Serial.begin(115200);
   while(!Serial) { delay(100);};