Make sure the initial keys that are put to use are one time generated not repeatedly.
Go to Puttykeygen-> conversions-> import the private key(.ppk file) you have generated initially and then-> export openssh key-> save it to the same location and then go to IDEA and follow the below steps: 1. Go to Version control-> Checkout from Version Control-> Subversion and provide the same key and your passphrase. 2. click checkout by providing your username.
It should work!