[Python] pip install -r requirements.txt not installing libraries in VS code virtual...

I have created a virtual environment in VS code. When I am doing the command pip install -r requirements.txt.

Still the VS code says no such module found. However, if I individually do pip install <library> and it works like a charm. Why?

My requirements.txt file is

Flask==1.1.2
joblib==1.0.1
keras==2.6.0
matplotlib==3.3.4
numpy==1.21.2
pandas==1.3.3
requests==2.25.1
scikit_learn==1.0.2
seaborn==0.11.1
xgboost==1.5.1
utils==1.0.1
jellyfish==0.8.9
langdetect==1.0.9
nltk==3.6.1
spacy==3.2.0
textblob==0.17.1
vaderSentiment==3.3.2
ipython==7.30.1
gapminder==0.1
mlxtend==0.19.0
networkx==2.5
squarify==0.4.3
pandas-profiling==3.1.0
plotly==5.3.1
scikit_image==0.18.1
scipy==1.7.1
nbformat
squarify==0.4.3
gapminder==0.1
tensorflow==2.7
ipywidgets

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