items in quote marks are interpreted as data type string by the computer, the error might be triggered by how you have written the prefix &CONTROL calculation = 'relax' restart_mode = 'from_scratch' nstep = 999 tstress = .false. tprnfor = .true. outdir = 'pw.dir' prefix = ?pw' etot_conv_thr = 1e-06 forc_conv_thr = 0.001 trism = .true. /
*Robinson J. Musembi* Solid State and Materials Research Department of Physics, University of Nairobi -- ----------------------------------------- A KEBS 9001:2015 Certified Organization, No. KEBS/QMS/RF:064 Rev. 03
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