ABOUT ENTITY.INC

CAN SOMEONE KINDLY HELP ME WITH THE ERROR BELOW

EntityFieldQueryException: Unknown field: media_gallery_expose_block in EntityFieldQuery->addFieldCondition() (line 841 of /home/govgm/public_html/motie/includes/entity.inc).

AND ON LINE 841 BELOW IS THE CODE
/**
* Adds a condition on an entity-specific property.
*
* An $entity_type must be specified by calling
* EntityFieldCondition::entityCondition('entity_type', $entity_type) before
* executing the query. Also, by default only entities stored in SQL are
* supported; however, EntityFieldQuery::executeCallback can be set to handle
* different entity storage.
*
* @param $column
* A column defined in the hook_schema() of the base table of the entity.
* @param $value
* The value to test the field against. In most cases, this is a scalar. For
* more complex options, it is an array. The meaning of each element in the
* array is dependent on $operator.
* @param $operator
* Possible values:
* - '=', '<>', '>', '>=', '<', '<=', 'STARTS_WITH', 'CONTAINS': These
* operators expect $value to be a literal of the same type as the
* column.
* - 'IN', 'NOT IN': These operators expect $value to be an array of
* literals of the same type as the column.
* - 'BETWEEN': This operator expects $value to be an array of two literals
* of the same type as the column.
* The operator can be omitted, and will default to 'IN' if the value is an
* array, or to '=' otherwise.
*
* @return EntityFieldQuery
* The called object.
*/