Tiler is not working properly

[Pavel Tkachenko]

I've just installed and configured everything on the fresh DigitalOcean droplet.

Everything works perfectly except for the tiler.

Links like http://www.opentreemap.org.ua/tile/c4ca4238a0b923820dcc509a6f75849b/database/otm/table/treemap_mapfeature/8/160/100.grid.json?instance_id=2 are producing errors in the log:

Error: Cannot find module '/usr/local/tiler/node_modules/windshaft/node_modules/grainstore/node_modules/millstone/node_modules/srs/lib/binding/node-v48-linux-x64/srs.node'

    at Function.Module._resolveFilename (module.js:469:15)

    at Function.Module._load (module.js:417:25)

    at Module.require (module.js:497:17)

    at require (internal/module.js:20:19)

    at Object.<anonymous> (/usr/local/tiler/node_modules/windshaft/node_modules/grainstore/node_modules/millstone/node_modules/srs/lib/srs.js:18:11)

    at Module._compile (module.js:570:32)

    at Object.Module._extensions..js (module.js:579:10)

    at Module.load (module.js:487:32)

    at tryModuleLoad (module.js:446:12)

    at Function.Module._load (module.js:438:3)

Does anybody know how to fix it?

Thanks a lot.