macro for userform with one textbox and two optionbutton doesn't work

Hi,

I am trying to write a code for the "ok" button in a userform. The user fills in one textbox (txtperiode) and clicks on one of two optionbuttons (blnopt88 or blnopt89).
The entered data should be shown in cells a1 and b1. My code doesn't work. What am i doign wrong?

Any input is welcome!

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