The XPath which you have created is wrong because
//*[starts-with(@id,"FormView1_hidRevElement")]
this will return the matching count as 3 for the below id's
id="FormView1_hidRevElement12636"
id="FormView1_hidRevElement12637"
id="FormView1_hidRevElement12642"
And each id match equals 1 then obviously >1 condition will throw an error because it doesn't exist.
instead of that you can try using this :
(//*[starts-with(@id,"FormView1_hidRevElement")])[${i}]