PB Classic to .NET migrated application: Null object reference error

[Former Member]

Hello everyone,

We have an application in PB 12.5.2 Build 5583 and have migrated it from PB Classic to PB .NET. This is a PFC application.

After migration, we are getting 'Null object reference error' while trying to open a screen from the Menu. Other 2 screens from the same application opens fine. The error doesn't give much details and looks like -

System Error (pfc_systemerror)

Error Number 0.

Error test = Null object reference

Window/Menu/Object = .

Script = .

Line in Script = 0.

On debugging we see that the error seems to be somewhat related to Resize. The code goes multiple times through different Resize events like -

pfc_w_master.resize

pfc_w_frame.resize

pfc_n_cst_winsrv_statusbar.pfc_resize

pfc_u_dw.resize

Then at one point of time, the flow goes to systemerror event from the following code of pfc_w_master.resize event -

If IsValid (inv_preference) and This.windowstate = normal! then                     (--> goes to systemerror from here)

     inv_preference.Post of_setPosSize()

End If

Could you please help us to resolve this issue ?

thanks & regards,

Mazibar

[Former Member · Accepted solution]

Hi Mazibar.

In Wpf, you really don't need the resize service. Try working with wpf layouts. They are really powerfull. Also, what version of PFC are you using? In codeplex there was a separate PB.NET version of pfc's. Did you tried that release?

Andreas.

[Former Member · Accepted solution]

Hi Andreas,

Thank you very much for your inputs. This has actually helped me to resolve the issue.

PFC version is 8 - migrated over and over again. I am just couple of months into this project. May be soon we should think of upgrading PFC.

In my windows' pfc_preopen event, we had the following line:

This.changemenu(m_incd_type_sheet)

After commenting out this line, the null object reference error comes NO MORE.

What a relief !!!

thanks & regards,

Mazibar