How to resolve Error = 1001 "No Fill" using Facebook Audience Network in android

Question

I have an Android version of my app and integrated FAN into my Application. It worked for some months but now it's displaying "NO FILL"

Error Domain=com.facebook.ads.sdk Code=**1001 "No fill"** 
UserInfo={NSLocalizedDescription=**No fill**, 
FBAdErrorDetailKey={ msg = "**No fill**"}}

And no FAN ad is shown. If I put a testing ID then it's displaying, but only on my device, not for another device.

How to resolve this problem "No Fill"?

compile 'com.facebook.android:audience-network-sdk:4.+'

Mentioned in build.gradle I've seen many questions regarding this but unable to find an answer.

I've already seen below links:

1. Facebook AudienceNetwork loaded failure: No fill, Error Message "No fill", what is the reason about FaceBook android Advertise?

2. facebook audience network testing on test flight No Fill

3. Audience Network iOS Ads Suddenly Become "No Fill"

4. Facebook Audience Network returns "No fill"

5. Testing Audience Network Implementation

Answer 1

Try this.It solves my problem . you have to follow this steps for solve this problem In this all screenshot and steps are given .

May this help you. Because of the update in facebook developer console in audience Network tab ad-spaces group that is newly created from placements. You have to follow this steps. Might it helps others.

I have also posted screenshot along with steps details.

here Click on up-grouped for appName and then follow steps.

1. Tick check-mark box for any one ad then make placements button will be enable.

2. Enter name and description related to where ad will display in your app and then click on Move Button

3. After move one ad you can also select other ad from un-grouped ad and move it to ad-spaces , here it will shoe you choice for move to existing or create new one ad-space.
   

4. If you want to create new one then select radio button for new one . and click move after enter name and description.