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syncfusion_flutter_pdfviewer-20.1.60-beta Error: Method 'addObserver' cannot be called on 'WidgetsBinding?' because it is null [closed]

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Error occurring while using syncfution_flutter_pdfviewer-20.1.60-beta version
enter image description here

As error said you should change
WidgetsBinding?.instance.addPostFrameCallback
To
WidgetsBinding.instance?.addPostFrameCallback

Kindly upgrade to the latest version of Flutter SDK to get the issue resolved.
Flutter SDK setup link for the latest version: https://docs.flutter.dev/get-started/install/windows#get-the-flutter-sdk

Android with Kotlin, unable to find element by id [closed]

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After updating android studio to version 4.2 I am unable to find elements in an activity by their id name. At first I thought it was only a problem with the recyclerView, but I cannot find simple textViews or buttons even when it matches the id perfectly. What is happening here, it has broken all my android projects with hundreds of unresolved reference errors.

You might be using Synthetics, this is deprecated. I suggest you to migrate to View Binding:
https://developer.android.com/topic/libraries/view-binding/migration
For a proper solution I suggest giving more context on your question

java.lang.IllegalStateException: Expected Android API level 21+ but was 30 [closed]

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Solution Tried :
1. Upgraded Okhttp library's version
2. Downgraded OkHttp library's version
in both scenario app was crashing so now version is set to 4.9.0 and now app is not getting crashed but issue is that api is not getting called.

This error was fixed a long time ago. Upgrading to 4.9.1 should make it go away.
https://github.com/square/okhttp/blob/edf477cb4e7b1d59c6e3e5ac00870619340ce990/docs/changelog_3x.md#version-3147
But you haven't provided any detail to fix the other issue.

Cannot resolve method 'LoadAd' in 'View' [closed]

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Closed 3 years ago.
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So I am new to android programming. I'm trying to learn it so that I can work on my college project which is online food ordering application. So as being a newbie, I am refering to this video tutorials-
https://www.youtube.com/watch?v=Ad41Bh704ms&list=PLaoF-xhnnrRW4lXuIhNLhgVuYkIlF852V
The uploader is using android studio version 2.3.3,while I am using android studio 3.3.1 . So I am aware that there are few changes here and there. Right now, I am stuck at one such change from that version of picasso....
I have used the exact code group as him, but to me,it gives error at "load"
enter image description here
This is what it says-
enter image description here
I have added this version of picasso as dependency in my build.gradle..
enter image description here
Can anyone help me out here please? What could be triggering error in 'load',and how do I fix it? Thanks in advance

It's just a typo. Instead of writing
Picasso.with(getBaseContext().load(food.getImage())).into(food_image);
use
Picasso.with(getBaseContext()).load(food.getImage()).into(food_image);

You did a typing mistake over there. A method that is started must be closed. What you typed:
Picasso.with(getBaseContext().load(food.getImage())).into(food_image);
What is should be:
Picasso.with(getBaseContext()).load(food.getImage()).into(food_image);
^
Check that you started the with() method and didn't close it.

I cant connected to firebase Only this line implementation 'com.google.firebase:firebase-core:16.0.0:15.0.0' [closed]

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First, what caused this error?
implementation 'com.google.firebase:firebase-core:16.0.0:15.0.0'
Second, I just want to know how to resolve this kind of problem because I need to connect my app to Firebase.
When I add this Implement implementation com.google.firebase:firebase-core:16.0.4 , I lose my connection to firebase

You have the version declared twice: 15.0.0:16.0.0. Gradle has no idea what's going on there. Implement the following instead:
implementation com.google.firebase:firebase-core:16.0.4
16.0.4 is the latest.

I do have faced the similar problem and I think the below suggestion can help you to figure it out. What I understand from this is the consistency of version numbers on all firebase libraries. I used the firebase messaging library along with the core library of the different versions, but when I changed the version number as suggested it was working just fine.