Your key with fingerprint <fingerprint> is not authorized to access <appname>

Question

I am having multiple accounts with heroku with different email address. My old email address with heroku is working fine and I can push pull the code to heroku.

But with my new email account I am not keep getting error:

Your key with fingerprint is not authorized to access .

I have tried everything...

I have tried to clear my ssh-add with ssh-add -D

and when I check whether it is empty or not with ssh-add -l it still shows me a list of fingerprints in it.

2048 ec:ce:d7:4b:2e:c7:57:8e:af:50:1b:3a:ee:bc:5f:a0 dipen@dipen (RSA)
2048 82:92:0e:83:03:31:44:69:90:b9:77:d1:d2:08:e8:7a dipen@complitech.net (RSA)
2048 a0:47:c3:85:da:ad:76:a4:04:e7:34:1f:0c:1e:96:33 dipen@dipen (RSA)
2048 7b:80:1c:15:7b:a6:e7:17:2c:3f:13:b4:3c:96:37:6c dipen.bhanushali[at]gmail.com (RSA)
1024 35:b1:2b:aa:1d:f4:b1:85:74:93:9f:a7:a8:33:ce:37 dipen.bhanushali[at]gmail.com (DSA)

I have tried to add remove keys from the heroku account following steps like:

1. ssh-keygen -t dsa -C "comment"
2. ssh-add keyname
3. heroku keys:add keyname

but when I try to do git push heroku master it keep on showing me the error

Your key with fingerprint ec:ce:d7:4b:2e:c7:57:8e:af:50:1b:3a:ee:bc:5f:a0 is not authorized to access .

I have tried everything.

Please help. I think I need to remove the first finger print from the ssh-add but can not do it somehow.

My OS is "Ubuntu 12"