Liquid Warning: Liquid syntax error

[poudelmadhav]

I cloned and ran bundle install, success! After that, I ran rake preview but got the following error. Would anybody suggest how to fix this?

    Liquid Warning: Liquid syntax error (line 20): Expected dotdot but found comparison in "(page.categories.size > 0" in /_layouts/post.html
    Liquid Warning: Liquid syntax error (line 20): Expected dotdot but found comparison in "(page.categories.size > 0" in /_layouts/post.html
    Liquid Warning: Liquid syntax error (line 20): Expected dotdot but found comparison in "(page.categories.size > 0" in /_layouts/post.html
    Liquid Warning: Liquid syntax error (line 20): Expected dotdot but found comparison in "(page.categories.size > 0" in /_layouts/post.html
    Liquid Warning: Liquid syntax error (line 20): Expected dotdot but found comparison in "(page.categories.size > 0" in /_layouts/post.html
    Liquid Warning: Liquid syntax error (line 20): Expected dotdot but found comparison in "(page.categories.size > 0" in /_layouts/post.html
    Liquid Warning: Liquid syntax error (line 20): Expected dotdot but found comparison in "(page.categories.size > 0" in /_layouts/post.html
    Liquid Warning: Liquid syntax error (line 20): Expected dotdot but found comparison in "(page.categories.size > 0" in /_layouts/post.html
    Liquid Warning: Liquid syntax error (line 3): Expected id but found end_of_string in "{{post.url | append: '/' | replace: '//', '/' | prepend: site.baseurl | prepend: site.url | }}" in index.html
    Liquid Warning: Liquid syntax error (line 18): Expected id but found end_of_string in "{{ post.url | append: '/' | replace: '//', '/' | prepend: site.baseurl | prepend: site.url | }}" in index.html
    Liquid Warning: Liquid syntax error (line 24): Expected dotdot but found comparison in "(post.categories.size > 0" in index.html
    Liquid Warning: Liquid syntax error (line 35): Expected id but found end_of_string in "{{ post.url | append: '/' | replace: '//', '/' | prepend: site.baseurl | prepend: site.url | }}" in index.html
    Liquid Warning: Liquid syntax error (line 3): Expected id but found end_of_string in "{{post.url | append: '/' | replace: '//', '/' | prepend: site.baseurl | prepend: site.url | }}" in page2/index.html
    Liquid Warning: Liquid syntax error (line 18): Expected id but found end_of_string in "{{ post.url | append: '/' | replace: '//', '/' | prepend: site.baseurl | prepend: site.url | }}" in page2/index.html
    Liquid Warning: Liquid syntax error (line 24): Expected dotdot but found comparison in "(post.categories.size > 0" in page2/index.html
    Liquid Warning: Liquid syntax error (line 35): Expected id but found end_of_string in "{{ post.url | append: '/' | replace: '//', '/' | prepend: site.baseurl | prepend: site.url | }}" in page2/index.html