Fix some errors.

src/parser/element_parser.rs

@@ -21,13 +21,10 @@ use super::util::get_consumed;
 use super::util::maybe_consume_trailing_whitespace_if_not_exiting;
 
 use super::Context;
-use crate::error::CustomError;
-use crate::error::MyError;
 use crate::error::Res;
 use crate::parser::parser_with_context::parser_with_context;
 use crate::parser::table::org_mode_table;
 use nom::branch::alt;
-use nom::combinator::cond;
 use nom::combinator::map;
 use nom::combinator::verify;
 use nom::multi::many0;