Having some trouble here.
When I try to send bitcoin i get errors.
Here’s my commands:
PS D:\blockchain\bitcoin\daemon> ./bitcoin-cli -regtest sendtoaddress bcrt1qnqql0a580qyzr7mkz6d5w0kcze5w2nzhpene5f 10
error code: -4
error message:
Fee estimation failed. Fallbackfee is disabled. Wait a few blocks or enable -fallbackfee.
screenshot below:
Hey @developer, hope you are great.
Try to add this code line ad the end of your command, this will specify an standard fallback fee.
-fallbackfee='0.00001'
At the end will look like
./bitcoin-cli -regtest sendtoaddress [address] [amount] -fallbackfee='0.00001'
If you have any more questions, please let us know so we can help you! 
Carlos Z.