I'm receiving that error:
Error importing: error, Invalid type marker byte 0xfa for expected field name (or END_OBJECT marker) at [Source: LZ4BlockInputStream(in=org.apache.commons.fileupload.MultipartStream$ItemInputStream@60863785, decompressor=LZ4JavaUnsafeFastDecompressor, checksum=StreamingXXHash32JavaUnsafe(seed=-1756908916)); line: -1, column: 29769415]
It seems to be an error with jackson-dataformat-smile 2.6.1 and 2.6.6 seems to fix it.
How can I update only that file in the ThingWorx directory ?
I know where the emplacement of the file is, but it seems that I can't just modify the 2.6.1 file with the 2.6.6.
I found an article https://support.ptc.com/appserver/cs/view/solution.jsp?n=CS230864 that matches the error you describe.
Let us know if any of the workarounds mentioned in that article are helpful to you.
-- Craig A.