Power Automate Flow error

(0) Share

Report

Posted on by naveens1

Hi,

I have created Power automate flow based on instance but getting following error while calling though PVA.

Attached is the screen shot for reference, kindly help in this regard.

Error:

Action 'HTTP' failed

Error Details:

Value cannot be null. (Parameter 'Cannot pass null model to Validate.')

Thanks,

Categories:

General topics

I have the same question (0)

All responses (15)

Answers (0)

Expiscornovus 33,189 Most Valuable Professional on at

Like (0)

Report

Hi @naveens1,

It looks like you are inputting an empty value somewhere in your HTTP action.

Can you open up the flow in edit mode an share a screenshot of the whole flow (with all the actions expended, showing the config). This will help us with troubleshoot for the root cause.

Was this reply helpful? Yes No
naveens1 22 on at

Like (0)

Report

Hi,
Thanks for response, attached is the initial flow

Was this reply helpful? Yes No
Expiscornovus 33,189 Most Valuable Professional on at

Like (0)

Report
Hi @naveens1,

Looking at the docs I see more properties are in a payload. I would also place the body value between curly brackets btw {}

Here is a sample payload:

https://docs.microsoft.com/en-us/rest/api/cognitiveservices-qnamaker/qnamaker4.0/runtime/generate-answer?tabs=HTTP#request-body

Can you try it like below?

{ "question": "@{triggerBody()['text']}" }

Btw, I assume you enter some text in the Input field when running your test? 😉

Was this reply helpful? Yes No
naveens1 22 on at

Like (0)

Report

How about this attached screen shot as we can't add any qna from 1st oct'22 then what is the alternative for this as we always need the knowledge base as per required domain. Is Language Studio will support qna?
Kindly clarify...

Was this reply helpful? Yes No
Expiscornovus 33,189 Most Valuable Professional on at

Like (0)

Report

Hi @naveens1,

Language Studio has the Question Answering service which you should be able to use. That has a REST API as well, have a look at this doc:

https://docs.microsoft.com/en-us/rest/api/cognitiveservices/questionanswering/question-answering/get-answers?tabs=HTTP

Btw, you can also migrate your QnA to custom question answering in Language studio:

https://docs.microsoft.com/en-us/azure/cognitive-services/language-service/question-answering/how-to/migrate-qnamaker

Was this reply helpful? Yes No
naveens1 22 on at

Like (0)

Report

Hi, thanks for quick response!!
Now I have another question about is it possible to integrate Language studio with Power Virtual Agent?
If yes, then okay
if not, Then how to use PVA for chatbot?
I guess that PVA is much better than other options in Microsoft Services...

Was this reply helpful? Yes No
Expiscornovus 33,189 Most Valuable Professional on at

Like (0)

Report

Hi @naveens1,

Do you mean using input from users in the chatbot to get answers from the knowledge base and sent them back to the chatbot conversation? If so, yes that should be possible as well with Language studio.

You could interact with that REST API with for example the HTTP action. You could use the input from the user from the Power Virtual Agent as value within the body of that HTTP request. Similar as in the screenshot of your opening post 😀

I would only use the When a Power Virtual Agents calls a flow trigger action, instead of the When a HTTP request is received action.

Was this reply helpful? Yes No
naveens1 22 on at

Like (0)

Report

Hi,
So which one is better PVA or Language Studio, in terms of capturing sentence context, accuracy/confidence score?
Universal Sentence Transformer is also better in terms of capturing sentence context.

Was this reply helpful? Yes No
Expiscornovus 33,189 Most Valuable Professional on at

Like (0)

Report

Hi @naveens1,

Apologies if my last answer was not clear.

My response was, yes integration between PVA and Language studio is possible (via for example the REST API). So, you don't have to choose between the two 😉

Was this reply helpful? Yes No
naveens1 22 on at

Like (0)

Report

Looks like flow ran successfully but still last component - Return values to Power Virtual Agents have some issue, kindly look in to it and let me know how to tackle this one.

Thanks,

Was this reply helpful? Yes No