Read the log carefully. You asked it to read this file:
infile "folders/myfolders\calculator.csv" dsd dlm=',' firstobs=2;
And it is telling you that such a file does not exist:
ERROR: Physical file does not exist,
/opt/sasinside/SASConfig/Lev1/SASApp/folders/myfolders\calculator.csv.
Since you provided a RELATIVE filename it looked for the file in the current working directory and could not find it.
So first fix you file to to use the complete path, starting with the root node of /.
Also make sure to use / as the separator between directory names. On Unix the backslash is used to protect the next character.
infile "/folders/myfolders/calculator.csv" dsd dlm=',' firstobs=2;
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