this._err_msgs[0] = 'Unknown error.';
this._err_msgs[1] = 'Initialization not possible.';
this._err_msgs[2] = 'Not able to read setup file.';
this._err_msgs[3] = 'Input only possible from #1 to #2.';
this._err_msgs[4] = 'Calculation error.';
this._err_msgs[5] = 'Not able to save.';
this._err_msgs[6] = 'Not changeable during screen lock.';
this._err_msgs[7] = 'Not able to read data.';
this._err_msgs[8] = 'Projector is below the floor.';
this._err_msgs[9] = 'Screen position is below the floor.';
this._err_msgs[10] = 'Projector is above the ceiling.';
this._err_msgs[11] = 'Screen position is above the ceiling.';