$ hyde serve 

Error: (null-list?) bad argument type - not a list: #t

        Call history:

        sxml-tools/xpath-parser.scm:1220: txp:param-value         
        sxml-tools/xpath-parser.scm:1271: txp:param-value         
        sxml-tools/xpath-parser.scm:1273: txp:param-value         
        sxml-tools/xpath-parser.scm:1274: txp:param-value         
        sxml-tools/xpath-parser.scm:1275: txp:param-value         
        sxml-tools/xpath-parser.scm:1317: txp:param-value         
        sxml-tools/xpath-parser.scm:1354: txp:param-value         
        sxml-tools/xpath-parser.scm:1399: txp:param-value         
        sxml-tools/xpath-parser.scm:1491: txp:param-value         
        sxml-tools/xpath-parser.scm:1492: txp:param-value         
        sxml-tools/xpath-parser.scm:1494: txp:param-value         
        sxml-tools/txpath.scm:1049: sxml:api-helper       
        sxml-tools/txpath.scm:1051: sxml:api-helper       
        sxml-tools/txpath.scm:1053: sxml:api-helper       
        sxml-tools/txpath.scm:1102: sxml:api-index-helper         
        sxml-tools/txpath.scm:1104: sxml:api-index-helper               <--