ERROR: there is no parameter $1

Hi,

I'm using PQexecParams so I can upload filenames including path that
have '\' characters.  It works everywhere else I used it but not with
this query.

I get ERROR:  there is no parameter $1.

INSERT INTO FileVersionHistory(applicationID, filename, createFile,
changeSetID, userName) VALUES (1,$1::text,FALSE,9,'postgres');

outTemp[0]=deletedFiles.fileList[fileListIndex].filename;
outLengths[0]=strlen(deletedFiles.fileList[fileListIndex].filename);
formats[0]=0;
result = PQexecParams(pgConn, query,1,0,outTemp,outLengths,formats,0);

There obviously is a $1 parameter.

Ideas?