One of your filters uses a custom header that contains an invalid character, such as ':', a non-printable character, a non-ascii character, or an eight-bit ascii character. Please edit the msgFilterRules.dat file, which contains your filters, to remove invalid characters from your custom headers.
Jun chi ke ri taq achayub'al nrokisaj jun ichinan jub'i'aj ruk'wan jun man okel ta chi tz'ib', achi'el ':', jun man tz'ajel ta chi tz'ib', jun no-ASCII chi tz'ib' o jun tz'ib' tzijon rik'in ri ruwaqxaq-b'it. Tanuku' ri msgFilterRules.dat yakb'äl, ri eruk'wan ri taq achayub'al, richin yeyuj el ri man okel ta taq tz'ib' pa ri ichinan taq ajub'i'aj.