I am new to Ethereum. I have the v.0.8.7 client. It is fully synchronized with the blockchain (see screenshot below: last block seen a minute ago).

I am basing myself on this post.

If I understood correctly, my Client is currently synchronised with Morden (the article really does not explain things in a noob-understanable manner). So I have to swich to Ropsten.

I entered the commands specified at the bottom of the article, and get the following error.

dyn907-72:~ me$ ls  /Users/me/Library/Ethereum/testnet/
chaindata       keystore        testnet_genesis.json
dapp            nodekey
geth            nodes
dyn907-72:~ me$ geth --datadir /Users/me/Library/Ethereum/testnet init testnet_genesis.json
I1122 14:01:12.203789 ethdb/database.go:83] Alloted 16MB cache and 16 file handles to /Users/me/Library/Ethereum/testnet/chaindata
Fatal: failed to read genesis file: open testnet_genesis.json: no such file or directory
dyn907-72:~ me$

Why does it say "no such file exists" please? I m new to geth, needless to say. Thank you. enter image description here


You need to use the correct relative path or absolute path for your genesis JSON file.

Relative path would be:

geth --datadir ./Library/Ethereum/testnet init ./Library/Ethereum/testnet/testnet_genesis.json

However, with the absolute you are on the best path:

 geth --datadir /Users/sam/Library/Ethereum/testnet init /Users/sam/Library/Ethereum/testnet/testnet_genesis.json
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