Feed errors

Hi, merchant center is showing some errors. how do i fix this. i downloaded a report but don’t know how to put it on here. here is what it is saying:

`Encoding problem (double UTF8 encoding) in attribute: title
10
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Free listings
warning_amber
Attribute got truncated
1,012
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All
warning_amber
Encoding problem (private-use range chars) in attribute: description
46
–
All
warning_amber
Encoding problem (double UTF8 encoding) in attribute: description
31
–
All
warning_amber
Encoding problem in attribute: description
14
–
All
warning_amber
Encoding problem (double UTF8 encoding) in attribute: title
10
–
All