# B4J Questionerror CS0016: Could not write to output file Access is denied

#### mechanicaltesla

##### Member
Hi everyone,

When I go to Project/build standalone package I see error CS0016 on the logs and I also see that the company's antivirus software is treating this as Malware.
• B4JPackager11 Version 1.21
• error CS0016: Could not write to output file 'c:\Users\mainuser\MY PRODUCT FILTER.exe' -- 'Access is denied. '
• I tried Debug Mode (I know we are not supposed to do this)
• I tried Release
• I tried Release obfuscated (just to see what happens)
• in all instances, I got the error CS0016
• When I run the exe from a package that I compile a while back gets deleted by the antivirus software
Tehtris EPP (antivirus software)
• Advanced Threat Control has blocked a process that has been detected as malicious.

Any way to solve this problem?
Could signing the exe help? (not sure how to do this)

Thanks in advance for any help