node.js - Forever monitor and sqlite3 -

my node app returning

error: sqlite_cantopen: unable open database file 

my app has following structure:

.controllers/ |--getter.js |--setter.js .system.js .slave.js 

system.js

var forever = require('forever-monitor'); var path = require('path'); var relativedir = path.dirname(module.filename);  var childworker = new(forever.monitor)(path.join(relativedir,'slave.js'), {   max: 3,   silent: true,   options: [] }); 

slave.js

... var getter = require('./controllers/getter.js'); var setter = require('./controllers/setter.js'); ... 

getter.js/setter.js

var fs = require('fs'); var sqlite3 = require('sqlite3').verbose(); var dbpath = '/absolutepath/db'; if (fs.existssync(dbpath)) {   console.log("[getter] db file found");   var db = new sqlite3.database(dbpath, sqlite3.open_readonly); } else {   console.log("[getter] cannot find db file"); } 

i've tried changing absolute paths relative paths , changing owners of database without luck. app able find database file but, reason can't open it.

after made simple script "test.js" , placed in same dir "system.js". ran it, worked without errors , returned right values.

var sqlite3 = require("sqlite3"); var dbpath = "/absolutepath/db"; var db = new sqlite3.database(dbpath, sqlite3.open_readonly);  var sqlquery = 'select lat, long kkk'; db.get(sqlquery, function(err, row) {     if (err) {       console.log(err);       console.log('err!');     } else {       console.log(json.stringify(row));     }   }); 

write command " sudo chown www-data. . " in db file directory.

other solution check file exists or not ?

ex :

var fs = require("fs");

var exists = fs.existssync(dbfilepath);