Error deploying Python package to AWS lambda using Serverless framework

Question

I've followed this tutorial from the serverless website to try deploy my first AWS lambda function with a package dependency.

The error I get is STDERR: ERROR: Invalid requirement: '��' (from line 1 of /var/task/requirements.txt) I haven't been able to find a solution on using google. Having tried to go through the tutorial various times the same error keeps reoccurring, sometimes as ERROR: Invalid requirement: '\x00' or ERROR: Invalid requirement: '\x00\x01' or something similar. It seems to me that the serverless-python-requirements plugin is formatting it's own requirement file incorrectly, but I just don't know.

My requirements.txtwhen I have no dependencies is empty, which then translates to a serverless generated .serverless\requirements.txt:

��

When my requirements.txt is

numpy==1.19.2

this translates to a .serverless/requirements.txt as follows:

��n u m p y = = 1 . 1 9 . 2

I have gone through each step of the tutorial, and have not run into any problems until I run serverless deploy. This is the stack trace I get:

Serverless: Invoke deploy
Serverless: Invoke package
Serverless: Invoke aws:common:validate
Serverless: Invoke aws:common:cleanupTempDir
Serverless: Generated requirements from C:\Users\...\Documents\Serverless\my\requirements.txt in C:\Users\...\Documents\Serverless\my\.serverless\requirements.txt...
Serverless: Installing requirements from C:\Users\...\AppData\Local\UnitedIncome\serverless-python-requirements\Cache\943a69dded6372ca37aaaacaf21570a18766193003231d5130a067451373395d_slspyc\requirements.txt ...
Serverless: Docker Image: lambci/lambda:build-python3.8
Serverless: Trying bindPath C:/Users/.../AppData/Local/UnitedIncome/serverless-python-requirements/Cache/943a69dded6372ca37aaaacaf21570a18766193003231d5130a067451373395d_slspyc (run,--rm,-v,C:/Users/.../AppData/Local/UnitedIncome/serverless-python-requirements/Cache/943a69dded6372ca37aaaacaf21570a18766193003231d5130a067451373395d_slspyc:/test,alpine,ls,/test/requirements.txt)
Serverless: /test/requirements.txt
Serverless: Using download cache directory C:\Users\...\AppData\Local\UnitedIncome\serverless-python-requirements\Cache\downloadCacheslspyc
Serverless: Trying bindPath C:/Users/.../AppData/Local/UnitedIncome/serverless-python-requirements/Cache/downloadCacheslspyc (run,--rm,-v,C:/Users/.../AppData/Local/UnitedIncome/serverless-python-requirements/Cache/downloadCacheslspyc:/test,alpine,ls,/test/requirements.txt)
Serverless: /test/requirements.txt
Serverless: Running docker run --rm -v C\:/Users/.../AppData/Local/UnitedIncome/serverless-python-requirements/Cache/4870b1f009d955f0e7d5138512661e3ec4364d6a9c1e3c6cadc9d51a7e3b8dd2_slspyc\:/var/task\:z -v C\:/Users/.../AppData/Local/UnitedIncome/serverless-python-requirements/Cache/downloadCacheslspyc\:/var/useDownloadCache\:z -u 0 lambci/lambda\:build-python3.8 python -m pip install -t /var/task/ -r /var/task/requirements.txt --cache-dir /var/useDownloadCache...

  Error --------------------------------------------------

  Error: STDOUT:

  STDERR: ERROR: Invalid requirement: '��' (from line 1 of /var/task/requirements.txt)

      at C:\Users\...\Documents\Serverless\my\node_modules\serverless-python-requirements\lib\pip.js:325:13
      at Array.forEach (<anonymous>)
      at installRequirements (C:\Users\...\Documents\Serverless\my\node_modules\serverless-python-requirements\lib\pip.js:312:28)
      at installRequirementsIfNeeded (C:\Users\...\Documents\Serverless\my\node_modules\serverless-python-requirements\lib\pip.js:556:3)
      at ServerlessPythonRequirements.installAllRequirements (C:\Users\...\Documents\Serverless\my\node_modules\serverless-python-requirements\lib\pip.js:635:29)
  From previous event:
      at PluginManager.invoke (C:\Users\...\AppData\Roaming\npm\node_modules\serverless\lib\classes\PluginManager.js:498:22)
      at PluginManager.spawn (C:\Users\...\AppData\Roaming\npm\node_modules\serverless\lib\classes\PluginManager.js:518:17)
      at C:\Users\...\AppData\Roaming\npm\node_modules\serverless\lib\plugins\deploy\deploy.js:122:50
  From previous event:
      at Object.before:deploy:deploy [as hook] (C:\Users\...\AppData\Roaming\npm\node_modules\serverless\lib\plugins\deploy\deploy.js:102:22)
      at C:\Users\...\AppData\Roaming\npm\node_modules\serverless\lib\classes\PluginManager.js:498:55
  From previous event:
      at PluginManager.invoke (C:\Users\...\AppData\Roaming\npm\node_modules\serverless\lib\classes\PluginManager.js:498:22)
      at C:\Users\...\AppData\Roaming\npm\node_modules\serverless\lib\classes\PluginManager.js:533:24
  From previous event:
      at PluginManager.run (C:\Users\...\AppData\Roaming\npm\node_modules\serverless\lib\classes\PluginManager.js:533:8)
      at C:\Users\...\AppData\Roaming\npm\node_modules\serverless\lib\Serverless.js:168:33
  From previous event:
      at Serverless.run (C:\Users\...\AppData\Roaming\npm\node_modules\serverless\lib\Serverless.js:155:74)
      at C:\Users\...\AppData\Roaming\npm\node_modules\serverless\scripts\serverless.js:50:26
      at processImmediate (internal/timers.js:456:21)
  From previous event:
      at Object.<anonymous> (C:\Users\...\AppData\Roaming\npm\node_modules\serverless\scripts\serverless.js:50:4)
      at Module._compile (internal/modules/cjs/loader.js:1137:30)
      at Object.Module._extensions..js (internal/modules/cjs/loader.js:1157:10)
      at Module.load (internal/modules/cjs/loader.js:985:32)
      at Function.Module._load (internal/modules/cjs/loader.js:878:14)
      at Module.require (internal/modules/cjs/loader.js:1025:19)
      at require (internal/modules/cjs/helpers.js:72:18)
      at Object.<anonymous> (C:\Users\...\AppData\Roaming\npm\node_modules\serverless\bin\serverless.js:47:1)
      at Module._compile (internal/modules/cjs/loader.js:1137:30)
      at Object.Module._extensions..js (internal/modules/cjs/loader.js:1157:10)
      at Module.load (internal/modules/cjs/loader.js:985:32)
      at Function.Module._load (internal/modules/cjs/loader.js:878:14)
      at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
      at internal/main/run_main_module.js:17:47

  Get Support --------------------------------------------
     Docs:          docs.serverless.com
     Bugs:          github.com/serverless/serverless/issues
     Issues:        forum.serverless.com

  Your Environment Information ---------------------------
     Operating System:          win32
     Node Version:              12.18.4
     Framework Version:         2.1.1
     Plugin Version:            4.0.4
     SDK Version:               2.3.2
     Components Version:        3.1.3

Answer 1

Fix:

• Converting the requirements.txt to UTF8 will fix this issue. (tested on linux)
• Try converting requirements.txt to ASCII.

This is the problem with requirements.txt file encoding.

Detailed explanation

This is an open issue as on date 10th March 2022

The serverless plugin rewrites the file into .serverless directory & it assumes UTF8 encoding when it reads the file.

The problem occurs as serverless attempts to read a file with another encoding & then dump it into .serverless folder.

Serverless-python-requirements issue

Answer 2

Add dockerizePip command at the end then it will not show this error

custom:
  wsgi:
    app: handler.app
    pythonBin: python # Some systems with Python3 may require this
    packRequirements: false
  pythonRequirements:
    dockerizePip: non-linux

or delete the requirements.txt then enter serverless deploy and then paste requirements.txt and run again serverless deploy