Error message

Notice: Undefined variable: publicationDate in mybiblio_list_block_content() (line 216 of /fs/www/izvestiya_new/public/sites/all/modules/custom/biblio_list/biblio_list.module).
Notice: Undefined variable: volume in mybiblio_list_block_content() (line 217 of /fs/www/izvestiya_new/public/sites/all/modules/custom/biblio_list/biblio_list.module).
Notice: Undefined variable: issue in mybiblio_list_block_content() (line 218 of /fs/www/izvestiya_new/public/sites/all/modules/custom/biblio_list/biblio_list.module).
Notice: Undefined variable: volume in mybiblio_list_block_content() (line 261 of /fs/www/izvestiya_new/public/sites/all/modules/custom/biblio_list/biblio_list.module).
Notice: Undefined variable: issue in mybiblio_list_block_content() (line 261 of /fs/www/izvestiya_new/public/sites/all/modules/custom/biblio_list/biblio_list.module).
Notice: Undefined variable: Journal_year in mybiblio_list_block_content() (line 264 of /fs/www/izvestiya_new/public/sites/all/modules/custom/biblio_list/biblio_list.module).
Notice: Undefined variable: volume in mybiblio_list_block_content() (line 266 of /fs/www/izvestiya_new/public/sites/all/modules/custom/biblio_list/biblio_list.module).
Notice: Undefined variable: issue in mybiblio_list_block_content() (line 267 of /fs/www/izvestiya_new/public/sites/all/modules/custom/biblio_list/biblio_list.module).
Notice: Undefined variable: volume in mybiblio_list_block_content() (line 469 of /fs/www/izvestiya_new/public/sites/all/modules/custom/biblio_list/biblio_list.module).
Notice: Undefined variable: issue in mybiblio_list_block_content() (line 470 of /fs/www/izvestiya_new/public/sites/all/modules/custom/biblio_list/biblio_list.module).