[SalesForce] Error: An unknown exception has occurred

I did encounter the dreaded "An unknown exception has occurred" too; but it was when using related lookup filters which used reference fields to lookup to a 3rd object. The dependency checker in salesforce doenst seem to look beyound 1 level deep. I logged a case with them, which they accepted as an issue, are are trying to resolve.

My solution (i've not yet implemented) was to add logic in the scripts first step that edits page layouts and deploys them back prior to delete, to also clean up various things from .object files first too (related lookup filters, and perhaps rollup summary fields under simliar conditions). Then they undeployment should be allowed, this in principle though is very tricky due to the code possibly referencing these fields. So it thus is also necerssary to edit every class, trigger, page and empty them out and deploy too. I have some logic to do this, and will try and update the git hub repo soon.

Eric Wilcox (developer of the undeploy script)

I did further research on the SFDC developer forums to see if anyone was able to get it actually delete a record type. The only response I received was:

I checked the access level for the RecordType object through the schema explorer. The following access levels were mentioned - createable, queryable, replicatable, retrieveable, updateable. It does not say that it is deletable through the api. Thus I think if you try to delete record type records from the record type pbject you will be receiving that error.

Based on that and the error I receive, I would assume the documentation is incorrect.