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Without knowing the specific error message, it is difficult to provide a solution. However, here are some common mistakes that could cause errors when including variables in queries using PHP:

1. Not using quotes around string variables - If the variable is a string, it needs to be surrounded by quotes in the query. For example:

   $name = 'John';
   $query = "SELECT * FROM users WHERE name = '$name'";
   

2. Not properly escaping special characters - If the variable contains special characters (such as quotes or backslashes), it needs to be properly escaped to avoid syntax errors. For example:

   $email = "john.doe@example.com'; DROP TABLE users; --";
   $query = "SELECT * FROM users WHERE email = '" . addslashes($email) . "'";
   

3. Not using prepared statements - Using prepared statements is safer and more secure than injecting variables directly into a query. For example:

   $name = 'John';
   $stmt = $pdo->prepare('SELECT * FROM users WHERE name = :name');
   $stmt->execute(['name' => $name]);
   

If none of these solutions solve your error, please provide more information about the error message you are receiving.