找不到我的.plist，为什么？

我需要向我的plist写一个字符串，但是找不到plist，为什么？

在.h中

NSMutableDictionary *cameras;

.m文件

#define DOCUMENTS [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]

在ViewDidLoad中

NSString *plistPath = [DOCUMENTS stringByAppendingPathComponent:@"Сamera.plist"];
    if([[NSFileManager defaultManager] fileExistsAtPath:plistPath])
    {
        NSData *plistXML = [[NSFileManager defaultManager] contentsAtPath:plistPath];
        cameras = [NSMutableDictionary dictionaryWithDictionary:[NSPropertyListSerialization propertyListFromData:plistXML mutabilityOption:NSPropertyListMutableContainersAndLeaves format:nil errorDescription:nil]];
    }