Thank you for your responses.
I tried it, but there was no improvement. I tried to pick it up manually. And still, it said there is no source.
Maybe it's a bug. But idk.
On my screenshoot, there is one source.
But i still cannot take it
Why i can't collect my resource. Eventhough it already on my land Capture land over and over. But that's all. I don't know what to do. Please respond, cause i think this is can be a good game