Now I'm also getting this error when trying to send 10000 SNG:

Going to be hard setting up a masternode if I can't even send the collateral.
I've sent 10000 SNG to the new address in smaller increments. Clicking on Get Outputs button does not show anything.
not sure but I think you have to send exactly 10K in one transaction. Thats what i heard from every mastrnode guide out there regardless of coin/algo.
Wallet wouldn't let me send 10k at once.
Please follow the guide on faq:
https://snowgem.org/faqQ: I cant send 10000 SNG for the collateral, what should I do?
A: Please send some small amount to another address (called A) first, then increase number continuously (for example: 50, 100, 200, 300, 600, 1000, etc.) util all coin is sent to A. After that, just send 10000 SNG from A to the main wallet which you use for the MN.
That worked. Transferred 10k to s1c2QY5eWfPLbbEB6bGAGmgyJKngfoetNZw and now able to "Get Outputs".