Error while generating codes

[plantindesk]

{"**", "<b>"}, 
{"*", "<i>"}, 
{"_", "<u>"}, 
{"`", "<code>"}, 
{"##", "<h2>"}, 
"#", "<h1>",
 "[", "<a href=\"{0}\">"], 
"]", "</a>"}, 
{"\n", "<br>"}, 
{" ", "<span style=\"font-size: larger\">"}