[WINFORM] Configuration system failed to initialize when trying to access Settings value

Question

Hello Everyone
First time i want to store usersettings of my application
i created a setting like below
Name-Setting1,Type-string,Scope-user,Value-on
Now accessing it with the below code
string usersetting = Properties.Settings.Default.Setting1;
it threws the below error
Configuration system failed to initialize
Am new to handing settings!! any help?