Fixed the below issues..
FILE: /var/www/html/core/lib/Drupal/Core/Render/Element/Checkboxes.php
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FOUND 6 ERRORS AFFECTING 5 LINES
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129 | ERROR | [x] Line indented incorrectly; expected 8 spaces,
| | found 6
130 | ERROR | [x] Line indented incorrectly; expected 10 spaces,
| | found 8
131 | ERROR | [x] Line indented incorrectly; expected 12 spaces,
| | found 10
132 | ERROR | [x] Line indented incorrectly; expected 10 spaces,
| | found 8
133 | ERROR | [x] Line indented incorrectly; expected 8 spaces,
| | found 7
133 | ERROR | [x] Closing brace indented incorrectly; expected 6
| | spaces, found 7