I am trying to write a formula

=IF(N2=“zero”," 21",IF(AND(G2=0,H2=0),“ok, no diff”,“Q&Sum diff”))

I write it in this expression in “write Cell”:

“=IF(N2=”+CHR(34)+“zero”+CHR(34)+“,”+CHR(34)+“ 21”+CHR(34)+“,IF(AND(G2=0,H2=0),”+CHR(34)+“ok, no diff”+CHR(34)+“,”+CHR(34)+“Q&Sum diff”+CHR(34)+“))”

but the robot does not write the formula and gives the following error

please tell me what is the problem?