linq to entities doesn't recognize a method

I have those methods:

   public int count(
        Guid companyId, Expression<Func<T, bool>> isMatch)
    {
        var filters = new Expression<Func<T, bool>>[]{
            x => x.PriceDefinition.CompanyId == companyId,
            isMatch
        };

        return GetCount(filters);
    }

public virtual int GetCount(
            IEnumerable<Expression<Func<T, bool>>> filters)
        {
            IQueryable<T> _query = ObjectSet;

            if (filters != null)
            {
                foreach (var filter in filters)
                {
                    _query = _query.Where(filter);
                }
            }

           return _query.Count();
        }

When using:

count(some_guid, x => x.IsMatch(entityId, inviterId, routeId, luggageTypeId));

I get the following exception:

LINQ to Entities does not recognize the method 'Boolean IsMatch(System.Nullable`1[System.Int64], System.Nullable`1[System.Int64], System.Nullable`1[System.Int64], System.Nullable`1[System.Int64])' method, and this method cannot be translated into a store expression.

What is the reason for this?
Как я могу это решить?