Compile error when i try to open a calendar userform.

Hello

I get a

Compile error
User defined type not defined

And the part of the code with red fonts, become blue,When i try to open the frmCalendar userform.

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Leith Ross, has an excellent solution in this thread

which i am trying to make it to work in a new workbook.

When i try to open the frmCalendar userform i get this error. Can anyone help me pls?

Thanks in advance.

your class is

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and you try to use

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Thank you!!