Thanks for the explanation, so simply this is the problem i simply created a blockchain my walled. then funded the address that was generated in the creation of the wallet. when the bitcoin were in the wallet i tried to make a transaction later but it did tell me that the private key didn't match the address. i didnt make the address "watch only" i didn't touch the private key.
Hm, that is very odd. Maybe it is a bug. Or maybe some issue with the data.
Blockchain.info support will probably need to have a look at the contents of the wallet to further troubleshoot, unless they know why this is occurring.
So if you wanted to you might try exporting the private keys and importing them in another empty wallet on Blockchain.info. (So on the one you Import/Export, then export unencrypted. Then log out and create a second new wallet where you import the private key(s) and try to spend from there.)