Unable to import module 'wsgi_handler': No module named 'werkzeug'

[bibbycodes]

I keep getting this error in my AWS logs when trying to deploy using serverless:

Unable to import module 'wsgi_handler': No module named 'werkzeug'

It seems that the zip folder containing the app does not contain the right packages as specified in my requirements.txt and there is no .requirements folder either.

I have explicitly specified werkzeug in my requirements .txt and yet this package cannot be installed.

My serverless .yml:

service: serverless-flask
plugins:

• serverless-python-requirements
• serverless-wsgi
• serverless-dynamodb-local
  custom:
  tableName: 'transactions-table-${self:provider.stage}'
  wsgi:
  app: app.app # entrypoint is app.app, which means the app object in the app.py module.
  packRequirements: false
  pythonRequirements:
  dockerizePip: true
  dynamodb:
  stages:
  • test
  • dev
    start:
    migrate: true

provider:
name: aws
runtime: python3.6
stage: dev
region: us-east-1
iamRoleStatements:
- Effect: Allow
Action:
- dynamodb:Query
- dynamodb:Scan
- dynamodb:GetItem
- dynamodb:PutItem
Resource:
- { "Fn::GetAtt": ["TransactionsDynamoDBTable", "Arn" ] }
environment:
TRANSACTIONS_TABLE: ${self:custom.tableName}

functions:
app:
handler: wsgi_handler.handler
events:
- http: ANY /
- http: 'ANY {proxy+}'
resources:
Resources:
TransactionsDynamoDBTable:
Type: 'AWS::DynamoDB::Table'
Properties:
AttributeDefinitions:
-
AttributeName: transactionId
AttributeType: S
-
AttributeName: timestamp
AttributeType: S
KeySchema:
-
AttributeName: transactionId
KeyType: HASH
-
AttributeName: timestamp
KeyType: RANGE
ProvisionedThroughput:
ReadCapacityUnits: 1
WriteCapacityUnits: 1
TableName: ${self:custom.tableName}
My requrements.txt :

boto3==1.11.17
botocore==1.14.17
Click==7.0
docutils==0.15.2
Flask==1.1.1
itsdangerous==1.1.0
Jinja2==2.11.1
jmespath==0.9.4
MarkupSafe==1.1.1
python-dateutil==2.8.1
s3transfer==0.3.3
six==1.14.0
urllib3==1.25.8
Werkzeug==1.0.0
Any ideas what I'm doing wrong here?

[revmischa]

Been seeing this too

[adamszeptycki]

same here...

[BenjaminWatts]

Same here

[4lph4-Ph4un]

The same!

[AndrewFarley]

logandk/serverless-wsgi#80

Can you guys rollback and version pin your version of serverless wsgi and make sure to be using the latest version of this plugin and try again? I suspect it is the plugin. I will do some testing of my own shortly.

[4lph4-Ph4un]

Mine was a false alarm, provided by not pointing to the correct requirements.txt, so all clear here even with the new version.

[Csanchezz]

did somebody find a way to fix this?

[eml-nx]

I found this in stackoverflow and it works I downgrade Flask to 1.1.4

Flask, Werkzeug and other pallets projects just had a major update, dropping python2 support and deleting _compat module. And AWS has't resolve the capability issue yet.
The simplest fix will be downgrading Flask, Werkzeug, etc. to the previous major version.

Credits to Allan Chain

[kevincerro]

For anyone here, this is solved since version 2.0.0.

Run sls plugin install -n serverless-wsgi on your terminal inside your project folder.
(At this moment, these command installs 3.0.0 version)

[mohammad-aqajani]

(take care this message means that aws lambda does not load any packages as layer)

for mine:
1- docker installed
2- create requirements.txt
3- reduce serverless framework version from 5.x to 4.x

Output:
Deploying eve-api to stage dev (us-east-1)
Using Python specified in "runtime": python3.8
Packaging Python WSGI handler...
Generated requirements from path/to/requirements.txt in path/to/repo/.serverless/requirements.txt...
Installing requirements from path/to/repo/.serverless/requirements/requirements.txt ...
Running ...
Injecting required Python packages to package...

[victorstefan13]

Facing the same issue, anyone found a solution?

[pgrzesik]

Could you share more context about your specific setup @victorstefan13? Are you using Flask or a similar framework? If yes, what version?

[victorstefan13]

So I managed to fix this. I think the issue was actually related to our deployment pipelines. I went down the route of pre-packing the app by creating a package directory and installing the python requirements within that directory - pip install -r requirements.txt -t package --no-deps --no-binary pydantic, copying my app to that directory and zipping the folder. Then in the serverless.yml file I specified the zipped package with artifact: package.zip. Thanks for your help!

[alex-morgun]

Bug Report: Serverless Offline Missing WSGI Files

Title: sls offline fails to create required WSGI files

Severity: High

Environment:

• Serverless Framework version: 4
• OS: Linux
• Python version: 3.8

Description:
sls offline doesn't create files, which are necessary for WSGI applications.

Steps to Reproduce:

1. Run sls deploy
2. Run sls offline
3. Observe missing files

Expected: sls offline creates required WSGI files
Actual: Files are not generated

Workaround:
Run sls wsgi install && sls offline

[pgrzesik]

Hey @alex-morgun - that should probably be reported within serverless-offline repository, unless you're certain that there's a bug within serverless-python-requirements plugin.

[alex-morgun]

Hey @alex-morgun - that should probably be reported within serverless-offline repository, unless you're certain that there's a bug within serverless-python-requirements plugin.

Hello, thanks, this is number one link in a google, so this is a way how to fix it. It's not an actual issue filled. Bu t thanks for an idea.