IDL Problem Code 71 with alias unknown-template-escape 
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Execution Error
This is a fatal error that prevents IDL from compiling or running code
This problem is detected when only part of an escape character is found.
Here's an example of this problem:
idl
a = `\`
;    ^illegal escapeTo fix this, add additional backslash or one of the approved escape characters from below.
idl
a = `\\`
;    ^^ OK!Allowed Escape Characters 
Here's a short list showing allowed escape characters that you can use:
idl
a = `\\`
a = `\$`
a = `\b`
a = `\f`
a = `\n`
a = `\r`
a = `\t`
a = `\v`
a = `\x00`