Of course an easier way would be to import your backup of the wallet into MultiBit (it is sent to the email you provided)
https://multibit.orgEdit: If you accidentally deleted the email with the attached .dat file - generate a new receiving address on your phone and you will be sent a new backup of wallet.dat
Thanks for trying but I already did all of this and none of it worked. Both blockchain's website and multibit are telling me to enter a password which is apparently not the pin code I used with Blockhain's app on my phone so I don't know what it's supposed to be. I don't remember needing a password when setting up the app, only the pin code. I'm waiting on a response from support. If I ever get the coins back I'll still give you something since you made the effort to try.
If anyone knows a solution, the .25btc is still on the table.
I'm upping the ante since I still haven't been able to figure this out, nor have I received a response from the developers... .5btc to whomever can help me get this to function properly. I can't send anyone anything until I can get the btc out of this wallet.
Are you sure you didn't enter any password when creating the wallet on your phone? If so, there should be no problem using your wallet with multibit.
If you chose the "Backup wallet" option from the app, do you get the popup about "Your encrypted wallet..."
I think that I set it up with only a pin code because I wanted basic security on this mobile wallet since it was to only be used for "petty cash." The backup file does have the .aes.json extension so it seems to require more than just a pin code if I want to load it into multibit, although I thought I wrote down everything I needed for this wallet when I set it up which was the pin code and wallet identifier. Since the pin code works with the app on my phone, I have no idea what the "other" password might be if there is indeed another password. Is there any way to check?
I've never spent any funds from this wallet so the only time I used it was when I set it up over a month ago and sent the initial btc to the wallet. It was only until I tried using some of the btc the other day that I discovered that the application would not allow for me to send my funds because of this "Error Response Invalid signature" which is why I'm trying so hard to figure this out now.