Weird Bex iView ClassCastException

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Hello Experts, I recently created several Bex iViews which reference to WAD files. Up until yesterday they all worked correctly. However, today one of them stopped working, giving me a ClassCastException. The others still work, the problem is only with this particular one. No changes were made to the iView, nor to the WAD file, nor to the queries. The error goes as follows:

java.lang.ClassCastException

at com.sap.ip.bi.webapplications.ui.items.filteritems.selection.characteristic.CharacteristicSelection.doSetSelectionOptions(CharacteristicSelection.java:284)

at com.sap.ip.bi.webapplications.ui.items.filteritems.selection.characteristic.CharacteristicSelection.setSelectionOptions(CharacteristicSelection.java:152)

at com.sap.ip.bi.webapplications.ui.items.filteritems.dropdown.DropDownItem.setSelectionOptionsFromParameters(DropDownItem.java:208)

at com.sap.ip.bi.webapplications.ui.items.filteritems.dropdown.DropDownItem.buildAcDropDown(DropDownItem.java:284)

at com.sap.ip.bi.webapplications.ui.items.filteritems.dropdown.DropDownItem.serializeStateParameters(DropDownItem.java:609)

And looking at the detailed error message, the first two lines confuse me:

com.sap.ip.bi.base.exception.BIBaseRuntimeException: Unknown Error

at com.sap.ip.bi.webapplications.runtime.impl.Page.processRequest(Page.java:2739)

So it is a ClassCastException, but in the detailed section it says it is an unknown error.

Any thoughts?