um... what are you talking about?

I tried sending 0.16 LTC, which equals around $45 USD. Their minimuim is 0.001 LTC, which is equal to around $2.85.

Even when I tried sending more than one FULL Litecoin, the same error ALWAYS appears.

Additionally, that link you referred to has nothing to do with sending Litecoin. I have no trouble buying and selling on coinbase. This time I specifically purchased 0.16664102 LTC using funds from my USD wallet, and it was a complete success, but the trouble is SENDING altcoins to external wallet addresses. That I am unable to do because the system is flagging ALL transactions of any size as below the minimum.