Getting issue in my existing project after importing in new flex trail version

Hi,

i have project already exist which is giving some some license iddue in my existing adobe flex editor. So i have installed new trail version and trying to execute my existing project there but hot many error while building swf file. got Error as Description Resource Path Location Type
1046: Type was not found or was not a compile-time constant: ColumnFilterBase. MDataGridColumn.as /OnlineRosterEditor_1/src/com/iwobanas/controls/dataGridClasses line 93 Flex Problem.

Could any on ehelp me out to resolve this issue please.

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