Objecttive-C各种问题

1.invalid argument type 'void' to unary expression

 1 @try{
 2         if (![mJQFMDB open]) {
 3             NSLog(@"Could not open db.");
 4             return NO;
 5         }else {
 6             NSArray *mLineInfoAry = responseObject[@"Data"];
 7             if(mLineInfoAry != nil && mLineInfoAry.count > 0) {
 8                 for (NSDictionary *lineInfo in mLineInfoAry) {
 9                     
10                 }
11             }
12             return YES;
13         }
14     }@catch(NSException *ex) {
15         [TExUtils uploadEx:ex];
16     }@finally {
17         [mFMDB close];
18     }

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