[SOLVED] planning calculation error - by: dep@eca.fr

I have one project who doesn't want to calculate gantt planning. I don't why ? I have this on log file:

2018-06-07 10:42:51.243 ***** ERROR ***** [V7.1.1] Exception-[HY000] SQLSTATE[HY000]: General error: 1205 Lock wait timeout exceeded; try restarting transaction
2018-06-07 10:42:51.243 ***** ERROR ***** [V7.1.1] For query : update assignment set idle='1' where refType='Meeting' and refId=74
2018-06-07 10:42:51.243 ***** ERROR ***** [V7.1.1] Strack trace :
2018-06-07 10:42:51.243 ***** ERROR ***** [V7.1.1] #0 Sql->query called at [/var/www/projeqtor/model/persistence/SqlElement.php:1504]
2018-06-07 10:42:51.243 ***** ERROR ***** [V7.1.1] #1 SqlElement->updateSqlElement called at [/var/www/projeqtor/model/persistence/SqlElement.php:981]
2018-06-07 10:42:51.243 ***** ERROR ***** [V7.1.1] #2 SqlElement->saveSqlElement called at [/var/www/projeqtor/model/persistence/SqlElement.php:650]
2018-06-07 10:42:51.243 ***** ERROR ***** [V7.1.1] #3 SqlElement->save called at [/var/www/projeqtor/model/MeetingMain.php:438]
2018-06-07 10:42:51.243 ***** ERROR ***** [V7.1.1] #4 MeetingMain->save called at [/var/www/projeqtor/tool/saveObject.php:78]

I have try to restart the Projeqtor machine, nothing happen !
it is on V7.1.1 version