no function found: IFERROR
=IFERROR(D3/C3,"123")
if(or(len(c2)=0,c3=0),"123",D3/C3)
用if就可以了,这里面的函数没有iferror
if(isnull(D3/C3) || len(D3/C3) = 0,"123",D3/C3)