Description:
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I have tried to create a script which stores data in to the mysql database but for some reason i am getting this error

Fatal error: Method name must be a string in D:\william\xampp\htdocs\personal\classwork\EXAMPLE2\admin\includes\addmenu.inc on line 28

I have tried to research and thought this might be a problem how can i fix this?

Reproduce code:
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The Changes i have made are by removing it but still doesnt insert the data into the database so how can i fix this? any ideas how this can be fixed?

include("../dbconnect.php");
$lQuery="INSERT INTO navmenu VALUES('','".$lname."','".$laddy."')";
echo $lQuery;

and under it i have 

if(!$rs)
{
echo "Error:".mysqli_error($con);
}

Expected result:
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i got the error when i click my submit button and didnt do anything i tried to do echo iquery that worked fine but without me going into the database it doesnt do anything.

Actual result:
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it is suppose to insert the data into the table called navmenu but doesnt do that unless i use the sql query so how can i fix this? if i do put the insert code it works just gives me that error