Every couple of weeks I see this SSAS error when processing one of my cubes:

Internal error: Invalid enumeration value. Please call customer support! is not a valid value for this element.

An error occurred while parsing the ‘StorageMode’ element at line 1, column 2217 (‘http://schemas.microsoft.com/analysisservices/2003/engine’ namespace) under Load/ObjectDefinition/Dimension/StorageMode.

Errors in the metadata manager. An error occurred when instantiating a metadata object from the file, ‘\\?\d:\Microsoft SQL Server\MSAS10.MSSQLSERVER\OLAP\Data\FinancialCubeTEST.0.db\DimSubLedger.5.dim.xml’.

I have seen this same error on more than one cube.  To fix this, remote into your server and delete the file specified in the error message (in this case, d:\Microsoft SQL Server\MSAS10.MSSQLSERVER\OLAP\Data\FinancialCubeTEST.0.db\DimSubLedger.5.dim.xml).

This usually works, but a few times it still did not fix it for me.  Then the only option is to login to Analysis Services and delete the database (deleting the cube is not enough).