不联网会出现另外的错误提示。你看下MPLAB 下面的MCC Log窗口输出内容。我用MPLABX 5.5可以打开Content，得到如下输出
17:21:47.675 INFO: Load event: LOADING
17:21:47.694 INFO: Fetching list of available libraries.
17:21:48.140 INFO: Download Complete: C:\Users\a41438\.mcc\mcc_libraries.xml
17:21:48.249 WARNING: There is no current core runner.
17:21:48.250 INFO: Device Changed. NewDevice = PIC18F45K42 OldDevice = PIC18F25Q10
17:21:48.267 INFO: MCC core services initializing.
17:21:48.307 INFO: Loaded content manager @ /C:/Users/a41438/.mcc/cores/5.3.3/content-manager/content-manager-ui.jar
17:21:48.308 INFO: Starting content manager.
17:21:48.340 INFO: Total time to fetch supported devices for Harmony: 5.273ms
17:21:48.341 INFO: Start MCC
17:21:48.341 INFO: Core Event: CoreLoadEvent
17:21:48.345 INFO: Core v5.3.3 loaded.
17:21:48.345 INFO: Project event: UNINITIALIZED
17:21:48.415 INFO: Connecting to content manager.
17:21:48.428 INFO: Content manager connection time: 13ms.
17:21:48.498 INFO: Total time to fetch supported devices for Classic: 161.312ms
17:21:49.949 INFO: Total time to fetch catalogs for Classic: 1612.515ms
17:21:49.964 INFO: Total time to fetch remote manifests for Classic: 1626.971ms
17:21:50.039 INFO: Time to find all classic libraries in C:\Users\a41438\.mcc\libraries: 90.477ms
17:21:50.046 INFO: Total time to fetch local manifests for Classic: 1708.879ms
17:21:52.284 INFO: Total time to fetch catalogs for Melody: 3949.471ms
17:21:52.293 INFO: Melody local content - getting installed Classic content: 8.221ms
17:21:52.380 INFO: Melody local content - getting installed Melody content: 94.971ms
17:21:52.390 INFO: Total time to fetch local manifests for Melody: 4056.208ms
17:21:55.501 INFO: Total time to fetch supported devices for Melody: 7166.804ms
17:21:55.956 INFO: Total time to fetch remote manifests for Melody: 7622.002ms
17:22:09.405 INFO: Total time to fetch catalogs for Harmony: 21070.537ms
你比较下看看? 另外试过其他电脑吗?
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