Hey guys,

when I click execution history in the jBPM console, the console crashes with the following exception:

2012-01-09 18:24:47,141 [ERROR] No subscribers for: JBPM_HISTORY_SERVICE<br/>Additional details:<br/>Attempt to send message to subject for which there are no subscribers
2012-01-09 18:25:18,008 [FATAL] Uncaught Exception:
com.google.gwt.core.client.JavaScriptException:
(TypeError): c is null
stack: zQc([object Object],null)@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:115
RHb([object Object],[object Object])@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:2843
iLc([object Object])@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:96
KJ([object Object])@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:1380
xO([object Object],[object Object],false)@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:3011
bO([object Object],[object Object])@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:2822
unb([object Object],[object Object])@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:1648
lJ([object MouseEvent],[object Object],[object HTMLButtonElement])@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:2777
xnb([object Object],[object MouseEvent])@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:2715
Lnb([object MouseEvent])@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:1173
Ejb([object MouseEvent],[object HTMLButtonElement],[object Object])@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:2603
([object MouseEvent])@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:3128
HA((function (a) {var b, c = this;while (c && !(b = c.__listener)) {c = c.parentNode;}c && c.nodeType != 1 && (c = null);b && qlb(b) && Ejb(a, c, b);}),[object HTMLButtonElement],[object Object])@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:2970
([object MouseEvent])@http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html:2261

fileName: http://localhost:8080/jbpm-console/app/36C12FADF4F13012869D4F98FF4ACD3E.cache.html
lineNumber: 115
    at Unknown.zQc(Unknown source:0)
    at Unknown.RHb(Unknown source:0)
    at Unknown.iLc(Unknown source:0)
    at Unknown.KJ(Unknown source:0)
    at Unknown.xO(Unknown source:0)
    at Unknown.bO(Unknown source:0)
    at Unknown.unb(Unknown source:0)
    at Unknown.lJ(Unknown source:0)
    at Unknown.xnb(Unknown source:0)
    at Unknown.Lnb(Unknown source:0)
    at Unknown.Ejb(Unknown source:0)
    at Unknown.anonymous(Unknown source:0)
    at Unknown.HA(Unknown source:0)
    at Unknown.anonymous(Unknown source:0)
    at Unknown.anonymous(Unknown source:0)
2012-01-09 18:26:22,676 [FATAL] Uncaught Exception:
java.lang.IllegalArgumentException:
must be positive
    at Unknown.cKb(Unknown source:0)
    at Unknown.Yx(Unknown source:0)
    at Unknown.g2c(Unknown source:0)
    at Unknown.cy(Unknown source:0)
    at Unknown.anonymous(Unknown source:0)
    at Unknown.HA(Unknown source:0)
    at Unknown.anonymous(Unknown source:0)
    at Unknown.anonymous(Unknown source:0)

What could be the reason?

Regards