Invalid key hash. The key hash does not match any stored key hashes
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This is how i solved this problem
Download your APK to your PC in java jdk\bin folder
bin folder might look like this
C:\Program Files\Java\jdk1.7.0_121\bin
go to java jdk\bin folder and run cmd then
copy the following command in your cmd
keytool -list -printcert -jarfile yourapkname.apk
Copy the SHA1 value, which looks like this
CD:A1:EA:A3:5C:5C:68:FB:FA:0A:6B:E5:5A:72:64:DD:26:8D:44:84
and open http://tomeko.net/online_tools/hex_to_base64.php to convert your SHA1 value to base64.
This is what Facebook requires. Copy base64 value and paste it in key hashes under settings->Basic -> Key hashes