ERROR: cannot insert multiple commands into a prepared statement

ERROR: cannot insert multiple commands into a prepared statement (SQLSTATE 42601)                                          
At statement: 317                                                                          CREATE OR REPLACE FUNCTION public.consume_book_credits_atomic(p_user_id uuid, p_project_id uuid, p_credits_to_consume integer)                                                                                                                                                                                      
 RETURNS void                                                                                                                                                                                                                                                                                                       
 LANGUAGE plpgsql                                                                                                                                                                                                                                                                                                   
 SECURITY DEFINER                                                                                                                                                                                                                                                                                                   
 SET search_path TO ''                                                                                                                                                                                                                                                                                              
AS $function$