_mysql_exceptions.IntegrityError: (1215, 'Cannot add foreign key constraint')

I use the Ontonotes DB tools, but I encounter a problem.

I read its document, and it say that this tool works well on mysql 5.0. However, I can't find this version. So, I install mysql 5.7. This problem appears, and the problem is like this:

python on/tools/init_db.py --init ontonotes localhost root ontonotes-release-4.0/

Initializing DB...

/Users/anaconda/lib/python2.7/site-packages/on/init.py:525: Warning: Unknown table 'ontonotes.tree' cursor.execute("""drop table if exists %s;""" % thing.sql_table_name)

create table tree
(
  id                  varchar(255) not null collate utf8_bin primary key,
  parent_id           varchar(255),
  document_id         varchar(255),
  word                varchar(255),
  child_index         int,
  start               int not null,
  end                 int not null,
  coref_section       int not null,
  syntactic_link_type varchar(255),
  tag                 varchar(255) not null,
  part_of_speech      varchar(255),
  phrase_type         varchar(255),
  function_tag_id     varchar(255),
  string              longtext,
  no_trace_string     longtext,
  parse               longtext,
  foreign key (parent_id)           references tree.id,
  foreign key (document_id)         references document.id,
  foreign key (syntactic_link_type) references syntactic_link_type.id,
  foreign key (part_of_speech)      references pos_type.id,
  foreign key (phrase_type)         references phrase_type.id,
  foreign key (function_tag_id)     references compound_function_tag.id
)
default character set utf8;

Traceback (most recent call last): File "on/tools/init_db.py", line 81, in on.ontonotes.initialize_db(a_cursor) File "/Users/anaconda/lib/python2.7/site-packages/on/init.py", line 528, in initialize_db cursor.execute(thing.sql_create_statement) File "/Users/anaconda/lib/python2.7/site-packages/MySQLdb/cursors.py", line 205, in execute self.errorhandler(self, exc, value) File "/Users/anaconda/lib/python2.7/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler raise errorclass, errorvalue _mysql_exceptions.IntegrityError: (1215, 'Cannot add foreign key constraint')

and there three table have been created:

create table ontonotes
(
   id varchar(255) not null primary key

)
default character set utf8;


create table subcorpus
(
  id varchar(255) not null primary key,
  base_dir varchar(255) not null,
  top_dir varchar(255) not null,
  root_dir varchar(255) not null,
  language_id varchar(255) not null,
  encoding_id varchar(255) not null,
  ontonotes_id varchar(255) not null

)
default character set utf8;

create table file
(
  id varchar(255) not null primary key,
  base_dir varchar(255) not null,
  physical_filename varchar(255) not null,
  document_id varchar(255) not null,
  file_type varchar(255) not null,
  subcorpus_id varchar(255) not null
)
default character set utf8;

I really don't know how to solve this problem, because I'm not familiar with mysql. Can someone help me, or give me a mysql 5.0 version (linux 64bit/mac 64bit)? Think you very much!