How many labels have you inserted??
Actually when When you place too many controls on a form then at the time of display it's size become too large that it cant show all the applications... So It generate that message!!
A single project can contain up to 32,000 "identifiers" (any nonreserved keyword), which include, but are not limited to, forms, controls, modules, variables, constants, procedures, functions, and objects. Note that the actual number of identifiers is limited to available memory
You can however get around the limitations at least the part of the controls by using control arrays as the limitation speaks directly to the identifier (label1, label2,...) but Label1(0), Label1(1), ... is only one identifier.