Question

Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘-[__NSCFType next]: unrecognized selector sent to instance ‘
this error is occuring because this line “[self autorelease];”
if i comment this line then the exception not come but app looks very slow,so please tell me that what could i wrote the line that instead of that line

if(sqlite3_step(statement)==SQLITE_ROW)
{                
     pagestr = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement,0)];
     //dateLabel.text=previousDate;
     //textView.text=pagestr;
     EditorPage* prev= [[EditorPage alloc] initWithNibName:@"EditorPage" bundle:nil];
     prev.dateString= previousDate;
     prev.bodyString= pagestr;
     NSArray* array= [[NSArray alloc] initWithObjects:prev,@"forward",nil];
     [[NSNotificationCenter defaultCenter] postNotificationName:@"next EditorPage" object:array];
     [prev autorelease];
}       

Answer 1

When do you do [ self autorelease ]? I think that’s very unusual–it’s probably incorrect.

This message means you are sending the message next to an object of NSCFType.

Messages like this are often caused by sending a message to an object that has been release and whose memory was subsequently reallocated to a different type of object.

You can turn on zombies to track down this kind of issue. Also, you could move your code to ARC to help avoid retain/release issues.