Invoke Method Add Error

Am adding to a dictionary using Invoke Method and methodName=Add. I keep getting an error (shown in the screenshot below):

This is from “RPA Developer - Production Ready Essentials”, part 3 - Data Manipulation, lesson 8 - Practice 3 - Dictionaries & Integers

Am trying to replicate the solution given in this lesson (at the bottom of the lesson). Funny thing is when I open the solution given in this lesson - “Practice 3 - Dictionaries (Workflow).zip” and run it in UiPath Studio, there is no “Invoke Method Add” error. I wonder why that is.

How do I get rid of this error?

8 Likes

@kewakerukeli What is the type of dictionary_NumberO ?

@supermanPunch, dictionary_NumberOfTimesWon is a variable of type Dictionary<String,Int32>

@kewakerukeli What parameters have you passed to Invoke Method?

@supermanPunch

Parameters passed to Invoke Method:

Target object = new Dictionary (of String, Int 32). In this instance the dictionary name = dictionary_NumberOfTimesWon

Metod name = Add

The error still remains:

Error ‘Dictionary`2’ does not have a public instance method named ‘Add’ matching the parameter types, generic type arguments, and generic type constraints supplied to InvokeMethod ‘Invoke Method - adding winner…’.

Funny thing is, the training script from UiPath studio is exactly the same, but I don’t get this error when I open that file. If I write the smae script with my own variable names, I get this error. That is strange.

@supermanPunch

Here’s the file from the UiPath Academy course, the training script: Practice 3 - Dictionaries (Workflow).zip (2.2 KB)

And, here’s the one I wrote. It’s exactly the same, except the variable names. This one gives an error: dictionaryVictoriesTourDeFrance-METHOD2.zip (14.0 KB)

@kewakerukeli Can you check the parameters in the Properties section :sweat_smile:

@supermanPunch,

The parameters for Invoke Method as in the properties sections are:

image

@kewakerukeli What values do you want to add to the dictionary ?

@supermanPunch,

The Invoke Mehod in this example adds the names of the winner (key) and the number of times they won (value).

It’s in both the zip files. What I don’t understand is why the training script (from UiPath Academy) won’t give an error, but the same code, when I write it on my own, gives an error.

@kewakerukeli Can you click the Parameters and show me values included? :sweat_smile:

1 Like

Hi,

Probably you should set parameter property of Invoke Method as the following.

Regards,

Yoichi

10 Likes

@supermanPunch,

Ok, got it now. Understood. There were no values in the parameters section of Invoke Method. Hence, the error.
Apologies. But, thanks to this discussion and @Yoichi’s illustration, I’ve understoon Invoke Method much better.

2 Likes

@Yoichi,

Got it. Thank you. Much clearer now.

1 Like

This topic was automatically closed 3 days after the last reply. New replies are no longer allowed.