Guys.. I found a solution for the error you getting. Its bcz you did 2 token contract transaction (i.e) you did the Step 3 twice. To solve this problem, transfer your Spark tokens to a new Ethereum wallet. And do the process 1 time properly. It will work. Its quite annoying till i found this. But finally, someone is doing the team's work here.
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How to check Swap tokens ? coz it is showing 0 ''Zero'' in sparkster address i have it from before in MEW