def init_context
@control = page_option(:control)
params = driver.params
@error_type = params['type']
@error_pos = params['id'].to_i
case (@error_type)
when 'load'
@error_sample = @control.setup_load_errors[@error_pos]
when 'logging'
@error_sample = @control.setup_logging_errors[@error_pos]
when 'alias'
@error_sample = @control.setup_alias_errors[@error_pos]
when 'document'
@error_sample = @control.setup_document_errors[@error_pos]
when 'filter'
@error_sample = @control.setup_filter_errors[@error_pos]
else
raise "unknown error type: #{@error_type.inspect}"
end
@frame_info = nil
@arg_value = nil
end