Fields not encrypted

I installed the 7.x-1.x-dev version of this module, created some new fields for user & content type. However, when I tried to save the form, the saving failed, fields are not encrypted (I confirmed this by looking into the database) and I got some warnings & notices below:

Notice: unserialize(): Error at offset 0 of 255 bytes in _encrypt_decrypt() (line 175 of /work/workspace/web/drupal-7.9/sites/all/modules/contrib/encrypt/includes/encrypt.crypt.inc).

Notice: Undefined variable: items in _encrypted_text_node_field_names() (line 23 of /work/workspace/web/drupal-7.9/sites/all/modules/contrib/encrypted_text/encrypted_text.module).

Warning: Invalid argument supplied for foreach() in _encrypted_text_node_field_encrypt_decrypt() (line 28 of /work/workspace/web/drupal-7.9/sites/all/modules/contrib/encrypted_text/encrypted_text.module).

PDOException: in field_sql_storage_field_storage_write() (line 448 of /work/workspace/web/drupal-7.9/modules/field/modules/field_sql_storage/field_sql_storage.module).