Errno 20 Not a directory: '/tmp/tmp6db1q_sn/pyproject.toml/egg-info' - python-3.x

Question

I'm wrapping my colleague's code in an AWS SAM. I made a lambda to just call existing code with a run method which I did like this.
import json
from sentance_analyser_v2.main import run
def lambda_handler(event, context):
if (event['path'] == '/analyse'):
return RunAnalyser(event, context)
else:
return {
"statusCode": 200,
"body": json.dumps({
"message": "Hello"
}),
}
def RunAnalyser(event, context):
source = event['queryStringParameters']['source']
output = run(source)
return {
"statusCode": 200,
"body": json.dumps({
"output": json.dumps(output)
})
}
After running into numerous package problems I realized I forget to use the sam build --use-container command and I was hoping after a build it would solve some of my package errors but I ran into this error code -
Error: PythonPipBuilder:ResolveDependencies - [Errno 20] Not a directory: '/tmp/tmp6db1q_sn/pyproject.toml/egg-info'
After trying to understand what the freak that even is I started pulling my hairs out because there is nothing on this...
Here is the basic template that I currently use just so I can test that my wrapping worked. I'm still very new to AWS & SAM so I don't want to overcomplicate things just yet with the template.
AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: >
sam-app
Sample SAM Template for sam-app
Globals:
Function:
Timeout: 30
Tracing: Active
Api:
TracingEnabled: True
Resources:
MainLambda:
Type: AWS::Serverless::Function
Properties:
CodeUri: main_lambda/
Handler: app.lambda_handler
Runtime: python3.9
Architectures:
- x86_64
Events:
Analyser:
Type: Api
Properties:
Path: /analyse
Method: get
Outputs:
HelloEfsApi:
Description: "API Gateway endpoint URL for Prod stage for Hello EFS function"
Value: !Sub "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/hello/"