PS C:\Users\Sarp\Desktop\tutorial> truffle migrate
Error: No network specified. Cannot determine current network.
at Object.detect (C:\Users\Sarp\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:43157:23)
at C:\Users\Sarp\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:200497:19
at finished (C:\Users\Sarp\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:43085:9)
at C:\Users\Sarp\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:198408:14
at C:\Users\Sarp\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:68162:7
at C:\Users\Sarp\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:163793:9
at C:\Users\Sarp\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:160353:16
at replenish (C:\Users\Sarp\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:160873:25)
at iterateeCallback (C:\Users\Sarp\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:160863:17)
at C:\Users\Sarp\AppData\Roaming\npm\node_modules\truffle\build\cli.bundled.js:160838:16