I assume 1L8CvwLjmGQfHqrAN3ez5tRArQxwqJPawi is the deposit address you got from the exchange, and i also assume you were using some kind of web wallet or exchange to send the BTC from?
If these two assumptions are correct, you need to double check that 1L8CvwLjmGQfHqrAN3ez5tRArQxwqJPawi is indeed your deposit address, and if it is, contact ucoincash, since the problem is located on their end.
I have checked the deposit address and there were no problems at all. So I guess the problem is on ucoincash end, but I only have an hour left before the pre-sale begin and it's frustrating! I already submitted a ticket and an email but I'm still waiting for their response.