Just imported TNet via Asset window over the existing TNet.
Assets/TNet/Common/DataNode.cs(35,18): error CS0101: The namespace `TNet' already contains a definition for `IDataNodeSerializable'
Assets/TNet/Common/DataNode.cs(35,18): error CS0101: The namespace `TNet' already contains a definition for `DataNode'
Assets/TNet/Common/TNSerializer.cs(102,18): error CS0101: The namespace `TNet' already contains a definition for `IBinarySerializable'
Assets/TNet/Common/TNSerializer.cs(166,21): error CS0101: The namespace `TNet' already contains a definition for `Serialization'