how to install letodms in linux

[sappu]

in next step what should i enter in field
Core letoDMS directory:
Lucene LetoDMS directory:

iam giving /var/www/html/letodms/ but its not taking.....

Warning
Zend Framework : Not found
=> Install Zend Framework, if you intend to use the full text search engine
Error
Core letoDMS directory : Not found
=> Current value : /var/www/html/letodms/
=> Suggestion value : /var/www/html/letodms/


any solution.