java - for loop in selenium doesn't work -

code:

try {   //load file java   workbook workbook=workbook.getworkbook(sourceforcustomergroup);    //load sheet number (0 sheet 1)   sheet sheetforgroups= workbook.getsheet(0);    cell c1 = sheetforgroups.getcell(customercolumn, customerrow);   string customergroupname = c1.getcontents();    (int = 0; i<sheetforgroups.getrows(); i++, customerrow++) {     driver.findelement(by.id("tab3")).click();     driver.findelement(by.id("new")).click();     driver.findelement(by.id("groupname")).clear();     driver.findelement(by.id("groupname")).sendkeys(customergroupname);     driver.findelement(by.id("save")).click();      customerrow = 1;     customercolumn = 1;      (int j = 0; j<sheetforgroups.getrows()-1; j++, customerrow++) {       cell c2 = sheetforgroups.getcell(customercolumn, customerrow);       string clientuserid = c2.getcontents();        driver.findelement(by.id("clientuserid1")).clear();       driver.findelement(by.id("clientuserid1")).sendkeys(clientuserid);       driver.findelement(by.id("add")).click();     }      //doesn't work here     driver.findelement(by.id("actions")).click();     driver.findelement(by.id("save")).click();   } } 

the code doesn't seem run commands after second loop. have tried tracing manually , don't think i've made logical mistake (i hope stand corrected). what's wrong?