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## Hints

Hints are usually only informational. Although something has failed there is no real error in the sense of loss of data or inavailable functions. Following the hints and the additional remarks given in this section the problems can be solved.

1.
  `No substance database found - creating new.`
  For some reason the default substance database could not be found. Therefore a new file entitled `substance.odb` was created to generate a new default database. You may try to install manually or to copying another substance DB to the default name `substance.odb`.

2.
  `Sorry, it is not allowed to close this window.`
  You have tried to close the view of Europe (the GREAT-ER basic view) by the clicking on the close button ("X") on the window title bar. The resulting process would be similar to the menu item Exit but is not stable and may cause loss of data. For this reason the action is prevented. Please use the Exit item to close GREAT-ER.

3.
  `Sorry there is already an open scenario with this title.`
  It is not allowed to have two open scenarios with the same name. The scenario name is the key to identifying a scenario and must be unique. Please close the currently open scenario with the name in question if you want to open the new one.

4.
  `It is necessary to first save the scenario.`
  For reasons of stability and data safety it is only allowed to change catchment data for an unmodified scenario, i.e. a scenario directly saved before changing the catchment data.

5.
  `No substance specified for active scenario`
  No substance found for active scenario. As market data and discharge-site data dialogs offer users the opportunity to overwrite general substance settings by site-specific values, these are only applicable if a substance has already been selected.

6.
  `A simulation for this scenario seems to be still in progess.`
  This is a typical hint: currently not available, the function can be executed some time later because it is not possible to run more than one simulation at a time for a scenario.

7.
  `This selection tool has to be applied to the active scenario view`
  You have clicked on the view with the European overview while the subcatchment selection tool was active. The message appears, because it is not possible to select a stretch from the overview.

Next: Warnings Up: GREAT-ER Messages Previous: Conventions