I am trying to validate SAM file for further downstream processing using picard ValidateSAMFile command. But getting four types of error for ~50000 reads. Summary coming as:

Error Type Count

INVALID_MAPPING_QUALITY 21

MATE_NOT_FOUND 730

MISMATCH_FLAG_MATE_NEG_STRAND 51288

MISMATCH_FLAG_MATE_UNMAPPED 21

How to resolve these errors and also what are the probable reasons for these errors?

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