It means you do not meet the requirements for the Tourist Visa based upon what you have said your history is.
Savannakhet...
"Tourist Visa, apply if you stayed less than 90 days in past 6 month, show own Thai Book Bank with balance THB 20,000.- up OR print out from your Bank account from home country value USD 700.-up. OR Onward air ticket. "...
Is what
@Amornrat *********
has posted.