Creating a window panel to load excel file

I have written a procedure to create a window panel to load excel file as follows:

NewPanel

// Set the panel title

SetWindowTitle "Excel Loader Panel"

// Add a button to the panel for loading an Excel file

Button LoadExcelFile "Load Excel File"
 // Set the action for the LoadExcelFile button

ButtonAction LoadExcelFile {

  // Use the FileLoad command to load an Excel file

  FileLoad/T/D=data/F="*.xlsx"

}
 // Pack the panel to make it available for use

Pack

The procedure compiles with no error but when I run this code with Ctrl + Enter it says command Error expected wave name variable name or operation

Can someone help me out with this...