error msg I am getting

Careful we found one or more circular ref in your workbook that might cause your formulas to calculate incorrectly .

can some one please help me with this msg why I am getting this msg, and why I cannot copy the formula from one cell to another cell.

for example have AD50 has 9.62 % will like to copy on J 28 same 9.62% so it can calculates and automates , if the AD50 changes than J28 can changes also.

how to fix this circular Ref error msg,

thanks ins advance .