สอบถามหน่อยครับ Fatal error: Call to undefined function ของผม มันมีสาเหตุเกิดจากอะไรครับ ก่อนหน้านี้มันรันได้ครับ

$fname = $_FILES['proctor']['name'];
			$target = "files/".$_FILES['proctor']['name'];
			move_uploaded_file($_FILES['proctor']['tmp_name'],$target);
			$strSQL = "INSERT INTO log_file (LogFile_FName,LogFile_Date,LogType_Id_FK) Values ('$fname','$curDateTime','f01')";
			$objQuery = mysql_query($strSQL);
			importProc($target);

function importProc($fname){
			$inputFileName = $fname; 
			$inputFileType = PHPExcel_IOFactory::identify($inputFileName); 
			$objReader = PHPExcel_IOFactory::createReader($inputFileType); 
			$objReader->setReadDataOnly(true); 
			$objPHPExcel = $objReader->load($inputFileName); 
			 
			$objWorksheet = $objPHPExcel->setActiveSheetIndex(0);
			$highestRow = $objWorksheet->getHighestRow();
			$highestColumn = 'D';
			 
			$headingsArray = $objWorksheet->rangeToArray('A1:'.'E1',null, true, true, true);
			$headingsArray = $headingsArray[1];
			 
			$r = -1;
			$namedDataArray = array();
			for ($row = 2; $row <= $highestRow; ++$row) {
				$dataRow = $objWorksheet->rangeToArray('A'.$row.':'.'E'.$row,null, true, true, true);
				if ((isset($dataRow[$row]['A'])) && ($dataRow[$row]['A'] > '')) {
					++$r;
					foreach($headingsArray as $columnKey => $columnHeading) {
						$namedDataArray[$r][$columnHeading] = $dataRow[$row][$columnKey];
					}

				}
			}
			mysql_query('DELETE FROM personal;');
			$no = 1;
			foreach ($namedDataArray as $result) {
				if($departmentName != $result['Department']){
					$departmentName=$result['Department'];
					$strSQL = "SELECT * FROM department WHERE Depart_Name = '$departmentName';";
					mysql_query("SET NAMES UTF8");
					$objQuery = mysql_query($strSQL);
					$row= mysql_fetch_array($objQuery);
					$departmentID = $row[0];
				}
				$strSQL = "";
				$strSQL .= "INSERT INTO personal  ";
				$strSQL .= "(Person_Id,Person_Name,Person_Position, Person_Num_of_Proctor, Person_CurNum, Depart_Id_FK) ";
				$strSQL .= "VALUES ";
				$strSQL .= "(".$no.",'".$result["Name"]."','".$result["Position"]."' ";
				$strSQL .= ",".$result["Number"].","."0,'".$departmentID."')";
				mysql_query($strSQL) or die(mysql_error());
				$no= $no+1;
			}
			echo "file :  ".$_FILES['proctor']['name'].">>>>Upload Complete<br>";
						
		}