1) I tried to define a custom CRS in QGIS without success. I fill all fields and try to change project CRS. (all parameters is good) But I can't find custom CRS in list. I think that this is due to this error. 
2) This window opens at startup of the program. I tried to install all versions of QGIS from 2.6 to 2.18 and this error didn't disappear. What am I doing wrong?
3) I remove qgis.db and the error message and the error message don't open now. But I still can't define new custom CRS.I fill all fields with this parameters. 
When I try to change the project CRC I can't find it in list.
Answer
Several parameters are stored in qgis.db (sqlite database). It seems your database file was broken. Removing qgis.db not a good idea, you will lost several functionality of QGIS. Try to reinstall QGIS or copy qgis.db from an other machine. qgis.db is in the /usr/share/qgis/resource on a Linux box.
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