Connecting Arduino to Dynamo



I am trying to read acceleration data from an Arduino Uno by Dynamo. I am not very familiar with Firefly package, but I’ll search in the forum to get some helps. As you see below, in the first step I got some errors in reading the data. Could you please tell me what the problem is? I am using an Accelerometer ADXL345 to get the acceleration data, and I am gonna extract these data by Dynamo for further analysis. Your help is appreciated.