cannot find files when Open Unreal and use it to open DeepDrive.uproject

[ 0]LogLinker:Warning: Asset 'H:/deepdrive-sim-master/deepdrive-sim-master/Content/TuningCars/Textures/NUMBER.uasset' has been saved with empty engine version. The asset will be loaded but may be incompatible.
[2018.11.20-05.53.30:821][ 0]LogLinker:Warning: 无法寻找到文件'/Game/TuningCars/Maps/Demonstration_BuiltData'
[2018.11.20-05.53.30:821][ 0]LogLinker:Warning: 无法在加载H:/deepdrive-sim-master/deepdrive-sim-master/Content/TuningCars/Maps/Demonstration.umap时寻找到资源'/Game/TuningCars/Maps/Demonstration_BuiltData'的文件。
[2018.11.20-05.53.30:822][ 0]LoadErrors:Error: 错误 /Game/TuningCars/Maps/Demonstration : 无法寻找到资源的文件。 /Game/TuningCars/Maps/Demonstration_BuiltData
[2018.11.20-05.53.30:822][ 0]LogLinker:Warning: 无法寻找到文件'/Game/TuningCars/Maps/Demonstration_BuiltData'
[2018.11.20-05.53.30:822][ 0]LogLinker:Warning: 无法在加载H:/deepdrive-sim-master/deepdrive-sim-master/Content/TuningCars/Maps/Demonstration.umap时寻找到资源'/Game/TuningCars/Maps/Demonstration_BuiltData'的文件。
[2018.11.20-05.53.30:822][ 0]LoadErrors:Error: 错误 /Game/TuningCars/Maps/Demonstration : 无法寻找到资源的文件。 /Game/TuningCars/Maps/Demonstration_BuiltData
[2018.11.20-05.53.30:823][ 0]LogLinker:Warning: 无法寻找到文件'/Game/TuningCars/Maps/Demonstration_BuiltData'
[2018.11.20-05.53.30:823][ 0]LogLinker:Warning: 无法在加载NULL时寻找到资源'/Game/TuningCars/Maps/Demonstration_BuiltData'的文件。
[2018.11.20-05.53.30:823][ 0]LogLinker:Warning: 无法寻找到文件'/Game/TuningCars/Maps/Demonstration_BuiltData'
[2018.11.20-05.53.30:823][ 0]LogLinker:Warning: 无法在加载NULL时寻找到资源'/Game/TuningCars/Maps/Demonstration_BuiltData'的文件。
[2018.11.20-05.53.30:930][ 0]LogLinker:Warning: 无法寻找到文件'/Game/TuningCars/Maps/Demonstration_BuiltData'
[2018.11.20-05.53.30:930][ 0]LoadErrors: 信息 加载失败 /Game/TuningCars/Maps/Demonstration_BuiltData.Demonstration_BuiltData 引用者 PersistentLevel
[2018.11.20-05.53.30:930][ 0]LogLinker:Warning: 无法在加载NULL时寻找到资源'/Game/TuningCars/Maps/Demonstration_BuiltData'的文件。
[2018.11.20-05.53.30:930][ 0]LoadErrors: 信息 加载失败 /Game/TuningCars/Maps/Demonstration_BuiltData.Demonstration_BuiltData 引用者 PersistentLevel

Start by opening DeepDrive.uproject in Unreal and inspect Content/TuningCars/Maps/Demonstration.umap together with the missing Demonstration_BuiltData asset reported in the log. Determine why the map references that file and verify that Demonstration loads without missing-resource errors.

Written by the indexing model from the issue text.