[Tkinter] Tkinter bringing variables from 1 frame to another

[skm]

I have a DataFrame df_SEM instead of strings and I need to get column names of this DataFrame OptionList = list(df_SEM.columns). and want to populate this OptionsList to Tkinter Optionmenu. I did the same as you have suggested. defined DataFrames. But this returns an error:
opt = tk.OptionMenu(OptionFrame, variable, *OptionList)
TypeError: __init__() missing 1 required positional argument: 'value'

this is the code
OptionList = list(df_SEM.columns)
opt = tk.OptionMenu(OptionFrame, variable, *OptionList)