Error message: The operation + cannot accept the arguments "", ""

[Richael_Mehla]

@ABG But, I still the Do It option still isn't available to me.

[ABG]

What are you testing on?

• a phone ?
• an emulator?

[Richael_Mehla]

@ABG A phone.

[ChrisWard]

@Richael_Mehla

Hi Chris, it still isn't working and now there is a new error message.

Hi Richael

I think you need a large coffee
You have already discovered that when you get [""] it's an empty value - this means that the TextBox that contains Minutes must default to zero, so in the Blocks set it to zero ( "0"). Or alternatively test for a value first and if there is no value, set it to zero. That might be better since the User can delete a zero and then not replace it with anything.

[ABG]

Did you download the MIT AI2 Companion onto your phone and install it?

[Richael_Mehla]

@ABG Yes, I did download the MIT AI2 Companion

[ABG]

Is your phone connected to your PC with a USB cable?

[Richael_Mehla]

No, it is not connected to my PC with a USB cable

[ABG]

Does your phone have wireless (WiFi)?

[Richael_Mehla]

Yes, my phone does have wireless

[Richael_Mehla]

Thanks! It worked!

[ABG]

Continue connection procedure at
http://appinventor.mit.edu/explore/ai2/setup-device-wifi

[ChrisWard]

@Richael_Mehla

but the label only shows the value that the user just inputted. In other words, the value that gets stored does not add on to the value that was already there.

That would be the case the first time the User uses the App, since there are no stored minutes at that time. What happens the next time the App is opened and the User inputs minutes?

[Richael_Mehla]

Sorry, it was my fault, as you can see I stored the values in different tags

[ChrisWard]

There we go, you are learning how to bug hunt - it's always difficult to find your own typos and other mistakes.