terraform plan is giving the error : function call (function yamldecode)
As is describe in the fine manual:
Only one YAML document is permitted. If multiple documents are present in the given string then this function will return an error.
and one can trivially reproduce your error message:
content = yamldecode("---\nhello: world\n---\ntoo: bad\n") on main.tf line 14, in resource "local_file" "example": 14: content = yamldecode("---\nhello: world\n---\ntoo: bad\n")Call to function "yamldecode" failed: on line 2, column 1: unexpected extracontent after value.