How can i calculate the antiferromegnetic coupling constant in guassian 09 revisin?

Sara Koohzad @Sara_Koohzad2

01 January 1970 0 1K Report

my input is as follow

# ub3lyp/gen guess=(only,fragment=4)

but at the end of calculation get this message

this type of calculation cannot be archived

can anyone help me?

thank you so much

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