Getting this erro ActivePdftk::CommandError: Error: No input files. Exiting

[vkeziah]

[8] pry(#)> bic = ActivePdftk::Form.new(save_path)

WARNING: The locate database (/var/db/locate.database) does not exist.
To create the database, run the following command:

sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.locate.plist

Please be aware that the database can take some time to generate; once
the database has been created, this message will no longer appear.

=> #<ActivePdftk::Form:0x007fe158d01a10
@pdftk=#<ActivePdftk::Wrapper:0x007fe158d019c0 @call=#<ActivePdftk::Call:0x007fe158d01998 @default_statements={:path=>"pdftk"}>>,
@template=#Pathname:/Users/ratnakar/Documents/Projects/COM/board/nov/board/pdfs/filename.pdf>
[9] pry(#)> bic.set('year', '2016')
ActivePdftk::CommandError: Error: No input files. Exiting.
Errors encountered. No output created.
Done. Input errors, so no output created.
#!# While executing #=> pdftk dump_data_fields_utf8 output -
from /Users/ratnakar/.rvm/gems/ruby-2.3.1@compliance/bundler/gems/active_pdftk-a1065e8f0d21/lib/active_pdftk/call.rb:196:in `block in pdftk'