Error: Factory com.altera.sopcfactories.QsysFactory reading xxx.qsys exception com.altera.utilities.altNode.AltNodeException(in-memory string):Premature end of file.(XML)

Description

You may see the error above when open an empty or corrupted file of the xxx.qsys using the Platform designer (formerly Qsys).

Resolution

The available options is to use a previously saved design(before the corruption) or recreate the design from scratch.