I am using apache2 cloud server on ubuntu and i several reports that can be displayed over the web or to be exported as PDF (not cloudexport) since today I receive strange error message in Chrome "Error failed to load pdf document" although nothing is changed in the report code. When the same report is displayed over the web everything works. When the PDF file is downloaded and I try to open it with PDF viewer I the following message "It may be damaged or use a file format that Preview doesn’t recognize."

I tried restarting Apache server but did not work

this is the first lines of the file:

string(14) "Class_schedule"

%PDF-1.4 1 0 obj << /Title (��) /Creator (��) /Producer (���Q�t� �5�.�5�.�1) /CreationDate (D:20210820082513) >> endobj 2 0 obj << /Type /Catalog /Pages 3 0 R >> endobj 4 0 obj << /Type /ExtGState /SA true /SM 0.02 /ca 1.0 /CA 1.0 /AIS false /SMask /None>> endobj 5 0 obj [/Pattern /DeviceRGB] endobj 7 0 obj << /Type /XObject /Subtype /Image /Width 320 /Height 120 /BitsPerComponent 8 /ColorSpace /DeviceGray /Length 8 0 R /Filter /FlateDecode >> stream

the files starts with: string(14) "Class_schedule"

no space before hand

I recopied PhantomJS file to the bin folder in koolreport and restarted the ubuntu server. nothing helps. very strange that something starts like thing out of the blue!

I found the problem. I had a var_dump(...) command in my code and I did not see it. now everything works perfect. sorry!