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copied!<p><a href="https://stackoverflow.com/questions/12601191/facebook-sdk-3-1-error-validating-access-token">Another answer</a> gives a way to manually resync the device with the server. I defined a method called <code>fbRsync</code> to call this code. Make sure to <code>#import <Accounts/Accounts.h></code> in your implementation file and then define this method:</p> <pre><code>-(void)fbResync { ACAccountStore *accountStore; ACAccountType *accountTypeFB; if ((accountStore = [[ACAccountStore alloc] init]) && (accountTypeFB = [accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook] ) ){ NSArray *fbAccounts = [accountStore accountsWithAccountType:accountTypeFB]; id account; if (fbAccounts && [fbAccounts count] > 0 && (account = [fbAccounts objectAtIndex:0])){ [accountStore renewCredentialsForAccount:account completion:^(ACAccountCredentialRenewResult renewResult, NSError *error) { //we don't actually need to inspect renewResult or error. if (error){ } }]; } </code></pre> <p>}</p> <p>I then call <code>fbResync</code> if <code>openActiveSessionWithReadPermissions</code> yields an error:</p> <pre><code>[FBSession openActiveSessionWithReadPermissions:permissions allowLoginUI:YES completionHandler:^(FBSession *session, FBSessionState state, NSError *error) { if(error) { NSLog(@"Session error"); [self fbResync]; [NSThread sleepForTimeInterval:0.5]; //half a second [FBSession openActiveSessionWithReadPermissions:permissions allowLoginUI:YES completionHandler:^(FBSession *session, FBSessionState state, NSError *error) { [self sessionStateChanged:session state:state error:error]; }]; } else [self sessionStateChanged:session state:state error:error]; }]; </code></pre> <p>The half a second delay is likely unnecessary, but it currently gives me piece of mind.</p> <p>This seems to solve the problem for me. I can now switch between Facebook accounts and am able to log in. Yay!</p>

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