Session is already locked.

[Mikael Nilsson]

Why do I get this error?

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Exception message  : Session is already locked.
Session ID is invalid.
Exception class    : ESessionAlreadyLocked
Session ID        : ZYk2A1GFjwfY91jjTz9VpYFXpYe
Exception address  : 06490640
Exception Time    : 2019-11-08 13:35:56.691
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Application Name  : isapiXIBwwd.dll
Application Version: 1.0.0.0
Started at        : 2019-11-08 12:32:01.810
Running for        :  1 hour 3 minutes 54 seconds
Computer Name      : P-W-WWD-WEB01
Compiler Version  : 330
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IntraWeb Version  : 15.1.7
Multi-session      : False
Content Path      : D:\Inetpub\wwwroot\kundzon.itella.se\wwd\wwwroot\
Session count      : 724
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Client IP address  : 10.163.65.1
Request PathInfo  : /$/callback
Request Method    : POST
Request User Agent : Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.119 Safari/537.36
Cookies Count      : 1
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(0034F63B){isapiXIBwwd.dll} [0649063B] Unknown function at TMethodImplementationIntercept + $2DC82F
(0034EBD4){isapiXIBwwd.dll} [0648FBD4] Unknown function at TMethodImplementationIntercept + $2DBDC8
(0033D174){isapiXIBwwd.dll} [0647E174] Unknown function at TMethodImplementationIntercept + $2CA368
(0033D6F4){isapiXIBwwd.dll} [0647E6F4] Unknown function at TMethodImplementationIntercept + $2CA8E8
(0034B667){isapiXIBwwd.dll} [0648C667] Unknown function at TMethodImplementationIntercept + $2D885B
(00337F1C){isapiXIBwwd.dll} [06478F1C] Unknown function at TMethodImplementationIntercept + $2C5110
(00337D30){isapiXIBwwd.dll} [06478D30] Unknown function at TMethodImplementationIntercept + $2C4F24
(0035040C){isapiXIBwwd.dll} [0649140C] Unknown function at TMethodImplementationIntercept + $2DD600
(003506C4){isapiXIBwwd.dll} [064916C4] Unknown function at TMethodImplementationIntercept + $2DD8B8
(00009EF8){isapiXIBwwd.dll} [0614AEF8]