Timer boundary event : Unknown property used in expression

@tasso94 Here’s my bpmn file:
workflownew.bpmn (9.8 KB)

i’m starting the process with variable taskResolveDate which is String type.

In Timer start event i was converting to date using this function,

public class WorkflowUtil {
  public LocalDateTime getISOLocalDateTime(String dateValue) {
    return LocalDateTime.parse(dateValue);
  }
}

After setting variable scope also facing issues. Let me know how to resolve the variablescope issue?