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게시글 작성 후 파일첨부시 에러가 발생하는데요 어디가 문제일까요

Centos7 php7.1.2 mariadb10

ciboard v2.0.1

application/logs에서 에러로그

ERROR - 2017-11-14 23:46:36 --> Severity: Warning --> Illegal string offset 'upload_path' /var/www/html/application/con    trollers/Board_write.php 1786

  4 ERROR - 2017-11-14 23:46:36 --> Severity: Warning --> Illegal string offset 'allowed_types' /var/www/html/application/c    ontrollers/Board_write.php 1787

  5 ERROR - 2017-11-14 23:46:36 --> Severity: Warning --> Illegal string offset 'max_size' /var/www/html/application/contro    llers/Board_write.php 1789

  6 ERROR - 2017-11-14 23:46:36 --> Severity: Warning --> Illegal string offset 'encrypt_name' /var/www/html/application/co    ntrollers/Board_write.php 1790

  7 ERROR - 2017-11-14 23:46:36 --> Severity: error --> Exception: Argument 1 passed to CI_Upload::initialize() must be of     the type array, string given, called in /var/www/html/application/controllers/Board_write.php on line 1792 /var/www/htm    l/_system/libraries/Upload.php 311

아래사진은 파일첨부 후 작성완료 누르면 500 에러가 나오는 화면입니다.