Hi everyone,
I'm having hard time with py tasks cause i'm always getting computation error.
This is the log

<core_client_version>7.20.2</core_client_version>
<![CDATA[
<message>
Incorrect function.
 (0x1) - exit code 1 (0x1)</message>
<stderr_txt>
2022-09-03 11:33:51 (11308): Detected: vboxwrapper 26202
2022-09-03 11:33:51 (11308): Detected: BOINC client v7.20.2
2022-09-03 11:33:58 (11308): Error in guest additions for VM: -2147024891
Command:
VBoxManage -q list systemproperties
Output:
VBoxManage.exe: error: Failed to create the VirtualBox object!
VBoxManage.exe: error: The object is not ready
VBoxManage.exe: error: Details: code E_ACCESSDENIED (0x80070005), component VirtualBoxClientWrap, interface IVirtualBoxClient

2022-09-03 11:33:58 (11308): Detected: VirtualBox VboxManage Interface (Version: 6.1.36)
2022-09-03 11:34:05 (11308): Error in host info for VM: -2147024891
Command:
VBoxManage -q list hostinfo 
Output:
VBoxManage.exe: error: Failed to create the VirtualBox object!
VBoxManage.exe: error: The object is not ready
VBoxManage.exe: error: Details: code E_ACCESSDENIED (0x80070005), component VirtualBoxClientWrap, interface IVirtualBoxClient

2022-09-03 11:34:05 (11308): WARNING: Communication with VM Hypervisor failed.
2022-09-03 11:34:05 (11308): ERROR: VBoxManage list hostinfo failed
11:34:05 (11308): called boinc_finish(1)

</stderr_txt>
]]>

Does anyone have idea how to deal with these errors?

P.S. I tried to install virtualbox guest addition in an ubuntu VM and it does not work. Could it be linked somehow to this error?

2022-09-03 11:33:58 (11308): Error in guest additions for VM: -2147024891

I found out the problem, hope this could help anybody who has my same problem.
During the installation, I flagged the option “service install”, so boinc was installed as a daemon program and it had not enough privileges to communicate with VirtualBox.
After reinstalling it without the option “service install”, it finally runs python tasks.