the Screenshot of console
What stands out most is the highlighted (bold) part.
Caused by: com.mendix.systemwideinterfaces.MendixRuntimeException: Input ''{"1":{"name":"U_Name","dataType":"STRING","value":"'+$Register/UserName+'"},"2":{"name":"U_Pass","dataType":"STRING","value":"'+$Register/Password\n+'"},"3":{"name":"U_Add","dataType":"STRING","value":"'+$Register/Address+'"},"4":{"name":"U_Cont","dataType":"INTEGER","value":"'+$Register/PhoneNumber+'"},"5":{"name":"U_Gender","dataType":"STRING","value":"'+toString($Register/Gender)+'"},"6":{"name":"U_Email","dataType":"STRING","value":"'+$Register/EmailID+'"},"7":{"name":"U_FullName","dataType":"STRING","value":"'+$Register/FullName+'"},"8":{"name":"U_Lat","dataType":"DECIMAL","value":"'+parseDecimal($Register/Latitude)+'"},"9":{"name":"U_Long","dataType":"DECIMAL","value":"'+parseDecimal($Register/Lognitude)+'"}}'' could not be parsed
and a bit further
token recognition error at: '\'
Does not ring a bell to me what the root cause could be, but maybe you can take a look at where the $Register/Password attribute is used and see if you can figure out if something is wrong there.