OS Radiance w/PAT write access error

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I am running the Radiance measure with the PAT in OS. Everything has been working fine but then I recently had a few runs fail with the below error. All the other runs that were going at the same time went through fine. Only a few had the below error. One time I reran one of the failed runs and it completed fine.

rfluxmtx: running: rcontrib -fo+ -ab 10 -ad 65536 -as 512 -dj 1 -dp 1 -dt 0 -dc 1 -lw 1.52e-005 -n 1 -ds .15 -I -y 204 -faa -c 1 -o output/dc/WG10.vmx -f klems_full.cal -p RHS=+1 -bn Nkbins -b kbin(1,0,0,0,0,1) -m WG10_SHADE -o output/dc/WG11.vmx -p RHS=+1 -bn Nkbins -b kbin(0,1,0,0,0,1) -m WG11_SHADE -o output/dc/WG12.vmx -p RHS=+1 -bn Nkbins -b kbin(-1,0,0,0,0,1) -m WG12_SHADE -o output/dc/WG1.vmx -p RHS=+1 -bn Nkbins -b kbin(-1,0,0,0,0,1) -m WG1_SHADE -o output/dc/WG2.vmx -p RHS=+1 -bn Nkbins -b kbin(-1,0,0,0,0,1) -m WG2_SHADE -o output/dc/WG3.vmx -p RHS=+1 -bn Nkbins -b kbin(0,1,0,0,0,1) -m WG3_SHADE -o output/dc/WG4.vmx -p RHS=+1 -bn Nkbins -b kbin(1,-2.39095e-015,0,0,0,1) -m WG4_SHADE -o output/dc/WG5.vmx -p RHS=+1 -bn Nkbins -b kbin(2.24152e-016,1,-6.80387e-031,0,0,1) -m WG5_SHADE -o output/dc/WG6.vmx -p RHS=+1 -bn Nkbins -b kbin(-7.77059e-015,1,0,0,0,1) -m WG6_SHADE -o output/dc/WG7.vmx -p RHS=+1 -bn Nkbins -b kbin(-1,0,0,0,0,1) -m WG7_SHADE -o output/dc/WG8.vmx -p RHS=+1 -bn Nkbins -b kbin(1,0,0,0,0,1) -m WG8_SHADE -o output/dc/WG9.vmx -p RHS=+1 -bn Nkbins -b kbin(1,0,0,0,0,1) -m WG9_SHADE "!oconv -f -i octrees\model_vmx.oct receivers_vmx.rad"

C:/Program Files/OpenStudio 1.11.0/ruby-install/ruby/lib/ruby/2.0.0/fileutils.rb:519:in `rename': Permission denied - (kozvrt4nh5ragif, output/final_merge.tmp) (Errno::EACCES)

    from C:/Program Files/OpenStudio 1.11.0/ruby-install/ruby/lib/ruby/2.0.0/fileutils.rb:519:in `block in mv'

    from C:/Program Files/OpenStudio 1.11.0/ruby-install/ruby/lib/ruby/2.0.0/fileutils.rb:1558:in `block in fu_each_src_dest'

    from C:/Program Files/OpenStudio 1.11.0/ruby-install/ruby/lib/ruby/2.0.0/fileutils.rb:1574:in `fu_each_src_dest0'

    from C:/Program Files/OpenStudio 1.11.0/ruby-install/ruby/lib/ruby/2.0.0/fileutils.rb:1556:in `fu_each_src_dest'

    from C:/Program Files/OpenStudio 1.11.0/ruby-install/ruby/lib/ruby/2.0.0/fileutils.rb:508:in `mv'

    from C:/Determinant_J/Projects/T2419 CASE/Analysis/05 to 01 Shades/dataPoint3/18-UserScript-0/user_script.rb:952:in `block in runSimulation ...