AE Stamp Tool not working - won't show the cloning changes

[#1]

Hi there,

I've been trying to use the stamp tool for the first time in AE.

When trying to clone, it seems like it's detecting the cloning action, however I cannot see any visual changes happening. 

I've been trying to remove the white line between the first and second palette

And here I can see it recalls my action but not changes are happening.

Here's a picture for my settings

[#2]

Hi there,

I've been trying to use the stamp tool for the first time in AE.

When trying to clone, it seems like it's detecting the cloning action, however I cannot see any visual changes happening. 

I've been trying to remove the white line between the first and second palette

And here I can see it recalls my action but not changes are happening.

Here's a picture for my settings

[#3]

Sometimes I also get the same error. Can I know the reason? 

[#4]

Without a screenshot that shows us all of the modified properties of the layer using the clone stamp it's impossible to know what is going on. Select the layer, press uu, show us the entire UI so we can see the properties of the paint effect and help you figure out what is going on.