I've been working on a new 18.0 Webapp today and have gotten this error 4 times this afternoon, each time when I've created a new lookup. After the error everything seems to work ok & the lookup functions normally but the instructions were to report it...

Windoze 10 64-bit

C:\Program Files (x86)\DataFlex 18.1\Bin\Studio.exeAssert: Insertion point occurs before last root node in MergeDocumentAtLine


Error: 4402


Please report this error to Data Access Corporation


GET_MERGEDOCUMENTATLINE (14191) - oPasteManager (2909) - at address 129556
MSG_INSERTUSESTATEMENT (13663) - oDDColumnAttributeHandlerPromptObject (598) - at address 112576
MSG_ADDSETNODE (13648) - oDDColumnAttributeHandlerPromptObject (598) - at address 112389
MSG_SETCOLUMNATTRIBUTE (13655) - oDDColumnAttributeHandlerPromptObject (598) - at address 112252
MSG_SETCOLUMNATTRIBUTE (13655) - oObject (3837) - at address 121968
MSG_ADDNEWWEBPROMPTFORDD (15523) - oCreateNew (2170) - at address 176619
GET_PROCESSTRANSFERFILE (15525) - oCreateNew (2170) - at address 176686
GET_CREATENEWFROMWIZARD (15527) - oCreateNew (2170) - at address 176828
GET_CREATENEWCOMPONENT (15542) - oCreateNew (2170) - at address 177441
GET_NEWFILE (15543) - oCreateNew (2170) - at address 177479
GET_EXECUTE@0 (11959) - oStudioCommand (632) - at address 128506
MSG_ONCOMMAND@1 (11976) - oActionManager (611) - at address 85289
MSG_REQUESTCOMMAND (14730) - oNewWebObejct (817) - at address 151670
[start] - at address 236371