I'm using your quickbooks/v3-php-sdk php I'm getting this error https://prnt.sc/Yl58Ddudlqfv I've latest version 6.1.2 of that. can some one help me on this?

It is not the experience we want you to have while using the service, @fai2022. Rest assured, we are committed to helping you with this matter. We'll guide you to the appropriate support so that you can proceed to post a question on the Intuit Developer page.

Please know that even if the Community gives troubleshooting solutions and answers to specific concerns, there's some information that only our Intuit Developers can supply.

To address this and provide you with the best possible support, I recommend reaching out to our dedicated Intuit Development Support team for assistance. This way, they'll check the situation and provide you with a suitable solution so you can proceed to post a question on the Intuit Developer page.

Here's how you can get the help you need:

1. Go to this link: https://help.developer.intuit.com/s/.
2. Choose your QuickBooks product relevant to your integration.
3. Click on Ask a Question.
4. Sign in and follow the prompts appearing on the screen to continue.

Here’s an article that provides more in-depth information about the new app and compliance process: Develop your app.

We're delighted to welcome you to our Community. If you have any questions or concerns about managing your QuickBooks account, don't hesitate to ask. We'll do our best to assist you. Have a great day!

Thanks for your response.
I've already asked same question there, here is the link 
https://help.developer.intuit.com/s/question/0D5TR00000BJh2y0AD/im-using-quickbooksv3phpsdk-package-...