Heya,

Looks like you're not declaring your dependencies correctly. Try this instead?

nixpacks.toml:

```
nixPkgs = ["cmake", "g++", "gcc", "make", "python3", "pip", "pkgconfig"]

cmds = ["ln -sf $(which cmake) /usr/local/bin/cmake"]

[phases.install]

cmds = ["pip install -r requirements.txt"]
```

Tried with your code it failed this is the logs
|
```
==============

Apr 28 17:58:19

╔══════════════ Nixpacks v1.34.1 ══════════════╗

Apr 28 17:58:19

║──────────────────────────────────────────────║

Apr 28 17:58:19

║──────────────────────────────────────────────║

Apr 28 17:58:19

║ start │ python app.py ║

Apr 28 17:58:20

[internal] load build definition from Dockerfile 0ms

Apr 28 17:58:20

[internal] load build definition from Dockerfile 7ms

Apr 28 17:58:20

[internal] load .dockerignore 0ms

Apr 28 17:58:20

[internal] load .dockerignore

Apr 28 17:58:20

[stage-0 7/10] COPY . /app/.

Apr 28 17:58:20

[stage-0 4/10] RUN nix-env -if .nixpacks/nixpkgs-bc8f8d1be58e8c8383e683a06e1e1e57893fff87.nix && nix-collect-garbage -d

Apr 28 17:58:20

[internal] load build context 1ms

Apr 28 17:58:20

[internal] load build context

Apr 28 17:58:20

[internal] load build context 19ms

Apr 28 17:58:20

[stage-0 3/10] COPY .nixpacks/nixpkgs-bc8f8d1be58e8c8383e683a06e1e1e57893fff87.nix .nixpacks/nixpkgs-bc8f8d1be58e8c8383e683a06e1e1e57893fff87.nix

Apr 28 17:58:20

[stage-0 3/10] COPY .nixpacks/nixpkgs-bc8f8d1be58e8c8383e683a06e1e1e57893fff87.nix .nixpacks/nixpkgs-bc8f8d1be58e8c8383e683a06e1e1e57893fff87.nix 48ms

Apr 28 17:58:20

[stage-0 4/10] RUN nix-env -if .nixpacks/nixpkgs-bc8f8d1be58e8c8383e683a06e1e1e57893fff87.nix && nix-collect-garbage -d

Apr 28 17:58:42

installing 'bc8f8d1be58e8c8383e683a06e1e1e57893fff87-env'

Apr 28 17:58:43

these 4 derivations will be built: /nix/store/5jh1vzmj6xg1srdp4pgi04iwhc1myinj-builder.pl.drv /nix/store/w9wjpgsiwxjv9p6166ax2mns747lmv2c-libraries.drv /nix/store/g3lchy17nx4gv4bw71jnpiinxs47bg4s-bc8f8d1be58e8c8383e683a06e1e1e57893fff87-env.drv /nix/store/b0x1xin8h03k1qlv2w60817zvams9drr-bc8f8d1be58e8c8383e683a06e1e1e57893fff87-env.drv

Apr 28 17:58:43

these 60 paths will be fetched (125.16 MiB download, 519.13 MiB unpacked):

Apr 28 17:58:43

/nix/store/0dglgnjm2s5qg4ar6m33lpclqig0kg2x-acl-2.3.2 /nix/store/j2v823114cc2dqfvprlcx9h7i941kknh-attr-2.5.2 /nix/store/mm0pa3z7kk6jh1i9rkxqxjqmd8h1qpxf-bash-5.2p37

Apr 28 17:58:43

/nix/store/pbixrqd120nnw8a0ygfpm3mnwlr1mbj7-binutils-2.43.1 /nix/store/ywxfq90ijq9kys4g5wzyrg2f4in0iphd-binutils-2.43.1-lib /nix/store/l13l2ipc1xn5npjrw511y0yfh4ghinmf-binutils-wrapper-2.43.1 /nix/store/6amvjdayglsifq4lb2lrj4q5gwf4dicd-bzip2-1.0.8 /nix/store/0kxxaix9l5dbih90491mv96zajsac57q-bzip2-1.0.8-bin /nix/store/sf6y4arqcm100rnnl3dhpg732i774zp6-coreutils-9.5

Apr 28 17:58:43

/nix/store/alq4bqllykgwrif112yqgrn9g001kn7b-diffutils-3.10 /nix/store/b1rvxspjrw0f3y5iz4pcygams0n9yas4-ed-1.20.2 /nix/store/zx2bmicmgjh0inkgffd7agxz47j4xxql-expand-response-params

Apr 28 17:58:43

/nix/store/cnmw0v80xbp4ldc79an5kb2p8a3ia6k5-expat-2.6.3

Apr 28 17:58:43

/nix/store/vkv9a83hknlnr7p2z8mwl16j5pb502gp-file-5.45 /nix/store/psjqqbj19n3fqssn38hgz4cv7b7a9alp-findutils-4.10.0 /nix/store/1cd3p3kjh9c209s7832z8i3b8qcqggca-gawk-5.3.1 /nix/store/v7dbfh5n7az2lcap0z1cv4jq0bikya8p-gcc-13.3.0 /nix/store/s94fwp43xhzkvw8l8nqslskib99yifzi-gcc-13.3.0-lib /nix/store/c91k93z9yr1cpia2pf5dr226imglrkg5-gcc-13.3.0-libgcc /nix/store/zls8qr49k7bkdfb9ncqz9w38q5m8zkld-gcc-13.3.0-man /nix/store/hgw57m0jh2w10jsv8x86ng267pm5sla8-gcc-wrapper-13.3.0 /nix/store/bhd4nlz0993jcsmp7b4fpgjyc9knh1yx-gcc-wrapper-13.3.0-man /nix/store/h9bcdwky1hznar341kl52g7hidcjxfdc-gdbm-1.24-lib /nix/store/3bvxjkkmwlymr0fssczhgi39c3aj1l7i-glibc-2.40-36 /nix/store/5571d6dklkwfcp1812dj4lxb0gl3w1yw-glibc-2.40-36-bin /nix/store/932dj5qwfzck90mnvqpd1f9hjqznaqdj-glibc-2.40-36-dev /nix/store/fbir2hb0b8b9n9by2qkmr4sjscds5017-gmp-6.3.0 /nix/store/i2bs001zwvii9qbhk6mm291gqybpij87-gmp-with-cxx-6.3.0 /nix/store/vcwb5qr1yjn3pwbm9gnmvqmn1gwg9a1y-gnu-config-2024-01-01

Apr 28 17:58:43

/nix/store/nysgss3ggh3dv7mz08n28h29lazxhyc1-gnugrep-3.11 /nix/store/iyrpqn6ana7j804dzis338n74kzznmj0-gnumake-4.4.1 /nix/store/13wxcn0j2wk911ahfkbvdq241rkprsv8-gnused-4.9

Apr 28 17:58:43

/nix/store/cqyjb712c5q3axw9qjij05dnji2a7z48-gnutar-1.35

Apr 28 17:58:43

/nix/store/qfc6wq1wpxvkkjqa6xr5685ip97qc3sr-gzip-1.13 /nix/store/1v4kdwh68m221n160qxy1dgw64mg5z30-isl-0.20

Apr 28 17:58:43

/nix/store/0qiyy7llb8ldillvlvjz1pyawhs5cvpk-libffi-3.4.6 /nix/store/3wjcy2waiy7cr1v0kvi73aj6i90d878d-libidn2-2.3.7

```

nixPkgs = ["python311Full", "cmake", "g++", "gcc", "make", "pkgconfig"]

[phases.setup]

cmds = [

"echo 'Setting up cmake symlink...'",

"ln -sf $(which cmake) /usr/local/bin/cmake",

"echo 'cmake symlink created!'"

]

[phases.install]

cmds = [

"pip install -r requirements.txt",

]

[phases.start]

cmds = [

"echo 'Starting the application...'",

"python app.py"

]

this is the code and error is this

"python app.py" did not complete successfully: exit code: 1

View in context

Traceback (most recent call last):

File "/app/app.py", line 1, in <module>

from flask import Flask, request, render_template, send_from_directory, redirect, url_for, flash,session , Response

ModuleNotFoundError: No module named 'flask'

Looks like you need to declare a dependency on flask for the module path to resolve successfully. Give that a try?

Like see i am new to deploying , can you please a bit elabroate it will help me very much

Have you gone through some of our tutorials? If you can get that working, then I'm sure you can figure it out from there. https://docs.railway.com/guides/flask

In this case you don't have flask in your modules list, and you need that in your requirements.txt in order to function correctly.

from flask import Flask, request, render_template, send_from_directory, redirect, url_for, flash,session , Response

ModuleNotFoundError: No module named 'flask'