Having the same Issue.
Error: ereading Main Route Table Association (rtbassoc-0a95e462ceb94daf0): empty resulte with module.route_table.aws_main_route_table_association.rt-association[6], on …/…/modules/route_table/main.tf line 65, in resource “aws_main_route_table_association” “rt-association”: resource “aws_main_route_table_association” “rt-association”