i also deactivated and then activate cod but the problem didn't solve

yaa i have selected the plan and have done the first payment also i test oredered to but because of some vendor fulfiment issue it didnt get order and now im trying to order again i cant 

i have enabled COD but its not confirming order im doing test order but im unable to order because of this problem i didnt have this issue first time i ordered but im starting to get it now need to fix it as soon as possible