Missing “=” sign

I was struggling with this piece of code. I have one similar piece of code, and it was running perfectly. I have to go back and forth, delete gradually pieces and pieces of code to compare between the two.

Turn out that the mistake is really really small, as shown in line 38.

I'M MISSING THE =

The problem I got:

Name: org.apache.spark.SparkException
Message: Job aborted due to stage failure: Task 0 in stage 365.0 failed 4 times, most recent failure: Lost task 0.3 in stage 365.0 (TID 12524, lamar.homenet.telecomitalia.it): java.lang.ClassCastException

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