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02-29-2012 02:10 PM
I got the notice that my P1102W laserjet needs a firmware update. I downloaded LJP1100_P1560_P1600_FullSolution.exe. The install went OK. Then I downloaded the firmware file, which also installed OK. Then I re-booted my computer. I got the error message
An unhandled exception ("System.NullreferenceException") occured in HPLaserJetService.exe .
The Just-In_Time debugger was launched without necessary security permissions. To debug this process, the Just-in-time debugger must be run as an administrator. Would you like to debug this process?
Debugging yielded no useful information so far as I could see. I get the error every time I reboot. The printer seems to be working OK.
Can I revert to an earler driver? Is there a fix?
I am running Windows 7 64-bit Professional.
06-12-2012 03:45 PM
This may offer some help:
I am a support engineer for HP.
If the advice resolved the situation, please mark it as a solution. Thank you.
06-13-2012 09:01 AM
Thank you for the reply. I installed the update, and restarted the service and the problem still persist. I have actually sent documentation to HP support with the error message. One of the inconsistencies that I noticed during my talk with HP support is that the display name and the name of the service both has spaces in them. As I understand it, the name of the service should be without spaces. I am not sure if this is contributing to the problem, but you never know with string values and how they may contribute to a NULL exception unless you track down the memory allocation. I hope the problem is dealt with soon. I have the name of the rep that escalated it, but I don't know if I should put that in this message. Either way. Thanks.
06-24-2012 07:29 AM
Same error with Win 7-32 Ultimate and 1102w when booted. Have had it for months, Does not seem to be an issue with 3 other win 7 boxes on the network??? Also the 1102 will not pause for manual duplex printing--a real pain.
07-01-2012 12:24 PM
Me too, on Windows 7 64-bit, after installing the latest Full Solution for p1102w.
The problem occurs even when I later try to launch the service manually. I had thought it might be failing at startup because my wireless network connection wasn't yet connected.
07-10-2012 12:58 AM
Did you install the printer in USB mode or Wireless mode? If you uninstall the printer driver, does this issue persist?
I'm not sure why this occurs, and I cannot reproduce this issue myself. You may try one of the followings to see if the issue can be avoided:
1. Un-install the driver, and re-install the latest full solution driver on hp.com
2. Use smart install instead of full solution. If you connect USB from 1102w to your PC, you will find a new CD disk appeared in My Computers. You can enter that disk and run SISetup.exe
Let me know if it works for you.
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07-10-2012 06:42 AM
Go to www.hp.com Enter the product name / number. Be sure to check the additional information, like how to install the driver or troubleshooting guides.
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