<p>Dear CP2K developers and users,</p><p>I am currently trying to use the Amber ff19SB force field in CP2K for geometry optimization via the MM module. I generated a standard Amber topology file (.prmtop) using tleap, and attempted to load it into CP2K using:</p><p><br /></p><p>&FORCEFIELD<br /> PARMTYPE AMBER<br /> PARM_FILE_NAME LJ_fix.prmtop<br /> ...<br />&END FORCEFIELD</p><p><br /></p><p>
</p><p>However, the run fails with the following error:</p><p>Expecting %FORMAT. Not found! Abort reading of AMBER topology file!</p><p><br /></p><p>It appears (https://groups.google.com/g/cp2k/c/Fi02wK6Op5s) the issue arises from the presence of <span>%FLAG CMAP_*</span> sections in the <span>prmtop</span> file, which are introduced when using ff19SB. </p><p>I have a couple of questions for the developers or anyone who might have encountered this:</p><p><span></span></p><ol start="1"><li>
<p>Has this issue been addressed in the latest CP2K release (or in a development branch)?</p>
</li><li>
<p>Is there any ongoing effort to support CMAP terms and full ff19SB compatibility?</p></li></ol><p>I’d greatly appreciate any insight into this issue. Thanks in advance!</p><p>Giacomo</p>
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